This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Urinary Fistulas, Subject name: Gynaecology & Obstetrics
[{'content': 'Urinary incontinence in females is best investigated by: \nSelect and explain. \nA. Cystometry, B. Colonoscopy, C. Colposcopy, D. Cystoscopy', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Ans. is a, i.e. Cystometry(Ref: William Gynaec 3rd/ed, p526)Diagnostic procedures in urinary continence include-* Urinalysis and culture to rule out infection* Post voidal residual volume* Urodynamic studies done by cystometry.', 'role': 'assistant'}]