This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Oesophagus, Subject name: Surgery
[{'content': 'Most common foreign body in Children in Esophagus \nSelect and explain. \nA. Coin, B. Food, C. Krayons, D. marbles', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Ans. (a) CoinRef Bailey And Love 27th edition, Page 1073* Most common foreign body in esophagus in adult - Food bolus due to some underlying pathology causing narrowing* Most common foreign body in esophagus in children is coin* Most common site of foreign body impaction is cricopharynx', 'role': 'assistant'}]