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': 'Red flag sign in child development if not attained ? \nSelect and explain. \nA. Vocalization at 2 months, B. Walking at 12 months, C. Single word at 12 months, D. Standing alone at 16 month', 'role': 'user'}, {'content': "Answer: D \nExplanation: Ans. is 'd' i.e., Standing alone at l6 month Red flag sign of child developmentMilestoneAgeNo visual fixation or following by2 monthsNo vocalisation6 monthsNot siting without suppo9-10 monthsNot standing alone16 monthsNot walking alone18 monthsNot single word18 monthsLack of imaginative play3 years", 'role': 'assistant'}]