An assignment on "sexual identity" in the DeKalb County School District (DCSD) in Georgia given to sixth graders of Lithonia Middle School on Wednesday upset a parent, a report said.

The quiz assignment had questions wherein the students had to identify and differentiate between various sexual orientations and identities, FOX5 Atlanta reported.

However, it is still not known whether the assignment on "sexual identity" definitions is part of a district approved curriculum, the report said.

A student's mother, Octavia Parks, was appalled by the assignment when her 12-year-old daughter showed it to her. Parks felt that the material was inappropriate for school and that her daughter was too young to learn about it.

"Why are they teaching that in school?" Parks asked. "What does that have to do with life?"

Parks said her daughter still watched Nickelodeon and she was not ready to explain the terms such as lesbian, gay, bisexual and others to her daughter.

The mother also emphasized that on a previous occasion, she had spoken to the health teacher who had assured Parks that no material regarding sexual identity would be taught in the class.

"We had a brief conversation and she assured me that this sort of thing would not happen,” Parks said. “Nonetheless, it is happening."

Parks, who has taken the step of removing her child from the health classes, is not alone in finding an issue with the controversial assignment. Eva McClain, whose child used to study in Lithonia Middle School, agreed with Parks.

McClain also said that when her daughter was in the school, no such sexual orientation quiz was ever given to them.

Meanwhile, the school district acknowledged Parks' concern in a written statement.

“DCSD has been made aware of this alleged event, and is working to verify its authenticity. We will investigate this event and take action, as appropriate, once that investigation is completed,” a spokesman for the district told FOX 5.

However, instances like these are not unheard of wherein parents disagree with content taught in schools. For example, in April 2016, a Tampa teacher quit after parents of seventh and eighth graders at Monroe Middle School in Tampa, Florida, got furious when the teacher asked the students to mark down their gender, sexual orientation, disabilities, religion and other details — in a Spanish class, according to WTSP, a CBS-affiliate.

The teacher apparently handed out an English-language form titled "How Privileged Are You?" and it had questions for the students aged as young as 12 with regards to their identities, the report said.

In yet another instance in June 2015, parents opposed to the Fairfax County Public School board's decision to include lessons about homosexuality and gender identity in its Family Life Education curriculum, CBN News reported.

Many of the parents were concerned that they would not be able to opt their children out of the classes because these lessons were moved into health classes, which were mandatory to take.