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: Gynaecology & Obstetrics
[{'content': "The most appropriate method for collecting urine for culture in case of vesicovaginal fistula is : \nSelect and explain. \nA. Suprapubic needle aspiration, B. Midstream clean catch, C. Foley's catheter, D. Sterile speculum", 'role': 'user'}, {'content': "Answer: C \nExplanation: Foley's catheter", 'role': 'assistant'}]