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': 'Phenothiazines are used to: \nSelect and explain. \nA. Produce muscle relaxation, B. Alter psychotic behaviour, C. Suppress coughing, D. Produce analgesia', 'role': 'user'}, {'content': 'Answer: B \nExplanation: None', 'role': 'assistant'}]