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': 'Social smile is attained at what age? \nSelect and explain. \nA. 2 months, B. 5 months, C. 9 months, D. 1 year', 'role': 'user'}, {'content': "Answer: A \nExplanation: Ans. is 'a' i.e., 2 months * Social smile develops at 2 months.* Other milestones that develop at 2 months of age# In ventral suspension, lifts his head in the horizontal plane (in the plane of the body).# Follows object with steady movements of eye.# In prone position face is lifted to about 45deg.", 'role': 'assistant'}]