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': 'Sibutramine is ? \nSelect and explain. \nA. Antithyroid drug, B. Antiobesity drug, C. Antimalarial drug, D. Antitubercoulous drug', 'role': 'user'}, {'content': "Answer: A \nExplanation: Ans. is 'a' i.e., Endorphines Endorphins have major action on receptors. Enkephalins have major action on a receptors. Dynorphins have major action on c receptors.", 'role': 'assistant'}]