What facial feature is unique to humans?

Here is the question :

WHAT FACIAL FEATURE IS UNIQUE TO HUMANS?

Here is the option for the question :

• Lower eyelashes
• Eyebrows
• Earlobes
• Chin

The Answer:

And, the answer for the the question is :

Explanation:

[STC006518] Surprise! If you found yourself rubbing your chin while you thought about your response. That is a human ability alone! Actually, no other mammal has a chin. It’s not just the bottom of your face that makes up your chin. The name given to the bone that protrudes from your jaw is accurate. The bones below the jaws of other animals do exist, but none of them lean forward. Even the chimpanzee, who is the closest living relative of us, has a bone that runs behind rather than in front of their teeth, and Neanderthal skulls only reveal a flat bone where our chins are. Furthermore insane? Why we have chins is a mystery to scientists. Speaking and eating have both been fiercely contested working hypotheses, but this one has remained a chin-stroking enigma for centuries.