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 develops by age of? \nSelect and explain. \nA. 2 years, B. 3 years, C. 4 years, D. 5 years', 'role': 'user'}, {'content': "Answer: B \nExplanation: Ans. is 'b' i.e., 3 year Handedness is usually established by the 3rd yr. Frustration may result from attempts to change children's hand preference. Variations in fine motor development reflect both individual proclivities and different oppounities for learning. Children who are seldom allowed to use crayons, for example, develop a mature pencil grasp later", 'role': 'assistant'}]