This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Growth, Development, and Behavior, Subject name: Pediatrics
[{'content': 'The developmental implication of developmental milestone uncovers toys after seeing it hidden is: \nSelect and explain. \nA. Symbolic thought, B. Beginning of labelling, C. Object permanence, D. Self-discovery', 'role': 'user'}, {'content': "Answer: C \nExplanation: c. Object permanence(Ref: Nelson's 20/e p 66)MilestoneStares at own handUncovers toy (after seeing it hidden)Pretend play with doll (e.g., gives doll bottle)Developmental implicationSelf-discoveryObject permanenceSymbolic thought", 'role': 'assistant'}]