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': 'Estrogen therapy for urinary incontinence acts by all mechanisms except \nSelect and explain. \nA. Increase collagen deposition thereby increasing urethral coaptation., B. Increase α - adrenergic receptor sensitivity., C. Decreases vascularity of periurethral capillary plexus., D. Increase urethral blood flow and urethral closing pressure.', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Oestrogen administration increases vascularity of periurethral capillary plexus. Especially useful in menopausal women with urinary incontinence.', 'role': 'assistant'}]