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': 'Leeway space of Nance is utilized in \nSelect and explain. \nA. Early mesial shift of first permanent molars, B. Incisal liability, C. Late mesial shift of first permanent molars, D. Secondary spacing of first permanent molars', 'role': 'user'}, {'content': 'Answer: C \nExplanation: None', 'role': 'assistant'}]