This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Body composition and Acid base Balance, Subject name: Pediatrics
[{'content': 'At what age the ratio of the ICF to ECF volume approaches adult levels? \nSelect and explain. \nA. 14 days, B. 4 weeks, C. 6 months, D. 1 year', 'role': 'user'}, {'content': 'Answer: D \nExplanation: By 1 year of age, the ratio of the ICF to ECF volume approaches adult levels.', 'role': 'assistant'}]