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: Social & Preventive Medicine
[{'content': "All are true about NSV.  except, \nSelect and explain. \nA. Also know as 'key hole vasectomy', B. Painful procedure, C. Less Invasive, D. Surgical hook used", 'role': 'user'}, {'content': 'Answer: B \nExplanation: None', 'role': 'assistant'}]