This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: obstetrics,pediatrics and geriatrics, Subject name: Social & Preventive Medicine
[{'content': 'Deficit in weiught fo height in a 3 year old child indicates \nSelect and explain. \nA. Acute malnutrition, B. Chronic malnutrition, C. Concomitant acute and chronic, D. Underweight', 'role': 'user'}, {'content': "Answer: A \nExplanation: Ref:Park's Text book of Preventive and Social Medicine 25th ed", 'role': 'assistant'}]