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': 'Which of the following is more common in occurrence \nSelect and explain. \nA. Cleft palate only, B. Cleft lip only, C. Cleft lip and palate, D. All of the above have equal occurrence', 'role': 'user'}, {'content': 'Answer: C \nExplanation: The typical distribution of cleft types is:\n\nCleft lip alone: 15%;\nCleft lip and palate: 45%;\nIsolated cleft palate: 40%.', 'role': 'assistant'}]