Correct Answer: Pineal gland

Solution : The correct answer is the Pineal gland .

It is a tiny gland with a pinecone-like form that is situated in the epithalamus, a region of the brain that lies between the two hemispheres. The primary function of the pineal gland is to collect and communicate environmental data regarding the state of the light-dark cycle, which in turn allows the hormone melatonin to be created and emitted.