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': 'Average gain of height in first year is ? \nSelect and explain. \nA. 25 cm, B. 50 cm, C. 75 cm, D. 100cm', 'role': 'user'}, {'content': 'Answer: A \nExplanation: At birth, height is around 50 cm.\nAt one year, height is around 75 cm.\nThus gain in height in first year is 25 cm.', 'role': 'assistant'}]