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: Unknown
[{'content': 'Bioavailability of Ramelteon is? \nSelect and explain. \nA. 2%, B. 7%, C. 10%, D. 30%', 'role': 'user'}, {'content': "Answer: A \nExplanation: Reference: Goodman & Gilman's The Pharmacological Basis of Therapeutics, 12th ed., Pg. 1972.\nRamelteon is rapidly absorbed orally, undergoes extensive first pass metabolism in liver, so that bioavailability is low (F = 1.8%) and elimination t½ is 1–3 hours.", 'role': 'assistant'}]