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': 'After mixed dentition stage the arch length from first molar to first molar usually: (Or) The arch length from mixed dentition to permanent dentition \nSelect and explain. \nA. Remains same, B. Increases, C. Decreases, D. Doubles', 'role': 'user'}, {'content': 'Answer: C \nExplanation: None', 'role': 'assistant'}]