This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Endocrinology metabolism, Subject name: Physiology
[{'content': 'Melatonin is secreted by- \nSelect and explain. \nA. Hypothalamus, B. Adrenal cortex, C. Pineal gland, D. Melanocytes', 'role': 'user'}, {'content': "Answer: C \nExplanation: Ans. is 'c? i.e.. Pineal gland o The pineal gland is a small cone shaped structure lies in the center of the brain behind the third ventricle. It consists of two types of cells : i) Pinealocytes, and ii) Neuroglial cell. Pinealocytes predominate and produce hormone melatonin (N-acetyl-5-methoxytry famine).", 'role': 'assistant'}]