This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Sleep Disorders, Subject name: Psychiatry
[{'content': 'Melatonin is produced in all of the following, except? \nSelect and explain. \nA. Pineal gland, B. Suprachiasmatic nucleus, C. Gut, D. Retina', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Melatonin - Sleep hormone Pineal gland produces melatonin Retina and gut are other areas of secretion It works on melatonin receptors on the Suprachiasmatic nucleus Synchronizes the circadian rhythm with day and night change', 'role': 'assistant'}]