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': 'A 60 year old male presents with heamaturia at onset of micturition - cause is - \nSelect and explain. \nA. Urethral stone, B. Bladder tumor, C. Ureteric stone, D. Prostatitis', 'role': 'user'}, {'content': "Answer: A \nExplanation: Ans is 'a' ie. Urethral stone Relation of hematuria to micturition Site of bleeding * Blood appears at the beginning of act Urethra * Blood appears towards the end of the act Vesical * Blood is intimately mixed throughout the process Prerenal, renal or vesical.", 'role': 'assistant'}]