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': 'Propranolol should not be given to a patient on treatment with which of the following drug ? \nSelect and explain. \nA. Nifedipine, B. Nitrates, C. ACE inhibitors, D. Verapamil', 'role': 'user'}, {'content': 'Answer: D \nExplanation: None', 'role': 'assistant'}]