This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: All India exam, Subject name: ENT
[{'content': 'External auditory canal is formed by: \nSelect and explain. \nA. 1st branchial groove, B. 1st visceral pouch, C. 2nd branchial groove, D. 2nd visceral pouch', 'role': 'user'}, {'content': 'Answer: A \nExplanation: 1st branchial groove Ref : HAZARIKA 3RD ED.', 'role': 'assistant'}]