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: Surgery
[{'content': 'Commonest type of Ano rectal abscess is ? \nSelect and explain. \nA. Ischio rectal, B. Submucous, C. Pelvi-rectal, D. Perianal', 'role': 'user'}, {'content': "Answer: D \nExplanation: Ans. is 'd' i.e., Perianal", 'role': 'assistant'}]