This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Sedative-Hypnotics and Parkinsonism, Subject name: Pharmacology
[{'content': 'Increased tendency to fall asleep at night without causing central nervous system depression is a propey exhibited by: \nSelect and explain. \nA. Pyridoxine, B. Diphenhydramine, C. Melatonin, D. Ethanol', 'role': 'user'}, {'content': 'Answer: C \nExplanation: -Melatonin is an endogenous hormone secreted by pineal gland. -It regulates day night cycle. -It causes increased tendency to fall asleep at night without causing central nervous system depression', 'role': 'assistant'}]