This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: General obstetrics, Subject name: Anatomy
[{'content': 'The perineal injury can be prevented in normal labour bya all except \nSelect and explain. \nA. Maintaining flexion of head, B. Timely episotomy as a routine, C. Slow delivery of the head in between contractions, D. Effective perineal guard', 'role': 'user'}, {'content': 'Answer: B \nExplanation: An episotomy will increase the risk of tear into external and spinchter or rectum or both. Conversely anterior tears involving urethra and labia are more common in women in whom an episotomy is not cut . So timely episotomy as a routine should not be done and it should be individualised', 'role': 'assistant'}]