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': 'International food standards include \nSelect and explain. \nA. BIS standards, B. Codex alimentarius standards, C. AgMark standards, D. PFA standards', 'role': 'user'}, {'content': 'Answer: B \nExplanation: None', 'role': 'assistant'}]