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': 'Which of the following developmental milestones is first to happen? \nSelect and explain. \nA. Mirror play, B. Crawling, C. Creeping, D. Pincer grasp', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Mirror play develops at the earliest, from the given options. Mirror play - 6 months Crawling/Creeping - 11 months Pincer Grasp - 9 months Ref: Essential Pediatrics, OP Ghai - 6th Edition, Page 44', 'role': 'assistant'}]