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': 'Egocentrism and animation is found in the following\nstage of cognitive development? \nSelect and explain. \nA. Sensorimotor stage, B. Preoperational stage, C. Operational stage, D. Concrete operational', 'role': 'user'}, {'content': 'Answer: B \nExplanation: None', 'role': 'assistant'}]