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': 'Non-appearance of social smile even after ..... weeks, is considered as abnormal: September 2011 \nSelect and explain. \nA. 2 weeks, B. 4 weeks, C. 6 weeks, D. 8 weeks', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Ans. D: 8 weeks Child stas smiling back (social smile) when anyone talks to him or smiles at him by 6-8 weeks of age Impoant milestones: Head control: 1 month Sits with suppo: 5 months Transfer object from one hand to other: 6 months Crawls at: 8 months Says mama dada: 10 months Babies know his/ her gender: 3 years Can draw a circle: 3 years Self decisions: 7 years', 'role': 'assistant'}]