This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Pharmacology
[{'content': 'All of the following are true about sedatives & hypnotics except \nSelect and explain. \nA. Ramelton is a melatonin antagonist used to treat jet lag, B. Thiopentone is contraindicated in porphyrias, C. Midazolam is the shortest acting Benzodiazepine, D. Suvorexant is Orexin receptor antagonist used in insomnia', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Melatonin is secreted by pineal gland in darkness, which acts on Melatonin 1 & Melatonin 2 receptors to induce sleep.\nRamelton is a Melatonin receptor agonist used for sleep induction in Jet lag.', 'role': 'assistant'}]