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
Which is the earliest symptom of benign hypertrophy of prostate - 
Select and explain. 
A. Frequency, B. Haematuria, C. Incontinence, D. Strangury
A: Frequency
Answer: A: Frequency 
Explanation: None