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: Dental
[{'content': 'All of the following are contraindications of serial extraction, except : \nSelect and explain. \nA. Open bite., B. Flaring of anterior., C. Severe space deficiency greater than 10 mm., D. Nasal stenosis.', 'role': 'user'}, {'content': 'Answer: C \nExplanation: None', 'role': 'assistant'}]