Which of the following is not a vestigial organ in humans?

Correct answer: (c) Front flattened teeth (Incisors)

Explanation

A vestigial organ is one that has little or no use now but was functional in our ancestors. In humans these include the vermiform appendix, the nictitating membrane (the pink fold at the inner corner of the eye) and the muscles that move the ear (pinna).

The incisors, the flat front teeth, are fully functional (for biting and cutting), so they are not vestigial.