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': 'Aldosterone antagonists are not useful in the treatment of: \nSelect and explain. \nA. Hypertension., B. Congestive heart failure., C. Gynaecomastia., D. Hirsutism.', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Aldosterone antagonists cause gynecomastia as an adverse effect.', 'role': 'assistant'}]