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': 'The following drugs are useful in hypertension except \nSelect and explain. \nA. Calcium channel blockers, B. Alpha methyl dopa, C. Beta Mockers, D. Pentoxifyline', 'role': 'user'}, {'content': 'Answer: D \nExplanation: None', 'role': 'assistant'}]