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: Pediatrics
[{'content': 'A term newborn presents with frothing, excessive drooling of saliva, coughing of saliva. There was history of polyhydramnios in antenatal period. There is difficulty in passing a  nasogastric tube. What is the probable diagnosis? \nSelect and explain. \nA. Diaphragmatic hernia, B. Choanal atresia, C. Gastroschisis, D. Tracheo-esophageal fistula', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Tracheo-esophageal fistula :\n\nNewborn presents with frothing, excessive salivation.\nAssociated with polyhydramnios in antenatal period.\nNasogastric tube is inserted and inability to pass it confirms the diagnosis of TEF.', 'role': 'assistant'}]