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': 'The commonest type of tracheo-esophageal fistula is \nSelect and explain. \nA. Proximal end blind; distal end communicating with trachea, B. Distal end; blind proximal end communicating with trachea, C. Both ends blind, D. Both ends open', 'role': 'user'}, {'content': 'Answer: A \nExplanation: None', 'role': 'assistant'}]