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: Pediatrics
[{'content': 'Handedness gets firmly established by what age? \nSelect and explain. \nA. 2 years, B. 2.5 years, C. 3 years, D. 3.5 years', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Handedness begins at around 2 years.\nIt gets firmly established by 3 years.', 'role': 'assistant'}]