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: Medicine
[{'content': 'The first line of drug to be preferred for the treatment of akathesia is - \nSelect and explain. \nA. Benzhexol, B. Trihexy phenedyl hydrochloride, C. Promethazine, D. Propranolol', 'role': 'user'}, {'content': 'Answer: D \nExplanation: None', 'role': 'assistant'}]