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: ENT
[{'content': 'Commonest presentation of infant with bilateral choanal atresia - \nSelect and explain. \nA. Difficulty in breathing, B. Dysphagia, C. Smiling, D. Difficulty in walking', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Bilateral choanal atresia presents as respiratory distress in newborn and requires support immediately after birth.', 'role': 'assistant'}]