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: Surgery
[{'content': 'Which is the earliest symptom of benign hypertrophy of prostate - \nSelect and explain. \nA. Frequency, B. Haematuria, C. Incontinence, D. Strangury', 'role': 'user'}, {'content': 'Answer: A \nExplanation: None', 'role': 'assistant'}]