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': 'Most common 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: Ans. is a i.e. Difficulty in breathing Choanal atresia is usually U/L. If it occurs bilaterally the neonate presents with difficulty in breathing as infant is a nose breather and does not breathe from mouth. The neonate may have asphyxia and bilateral blockage of nose that also makes suckling difficult. U/L atresia presents with nasal obstruction including snoring but goes unidentified till adult life.', 'role': 'assistant'}]