This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Impoant Motor Milestones, Subject name: Pediatrics
[{'content': 'When is this gross motor milestone attained by a child? \nSelect and explain. \nA. 6 months, B. 12 months, C. 15 months, D. 24 months', 'role': 'user'}, {'content': 'Answer: C \nExplanation: The given picture shows a child creeping upstairs, that comes at around 15 months age; Another impoant milestone that appears at around 15 months age is Jargon speech', 'role': 'assistant'}]