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: Social & Preventive Medicine
[{'content': 'Prudent diet is \nSelect and explain. \nA. Diet, which contains variety of foods to safe guard from deficiencies, B. Diet for dietary goal achievement, C. Diet on which a person or group lives, D. Diet, which fulfills recommended daily allowances', 'role': 'user'}, {'content': 'Answer: B \nExplanation: None', 'role': 'assistant'}]