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': 'Vitamin-A solution contains \nSelect and explain. \nA. 25,000 IU per ml, B. 1,00,000 IU per ml, C. 50,000 IU per ml, D. 2,00,000 IU per ml', 'role': 'user'}, {'content': 'Answer: B \nExplanation: None', 'role': 'assistant'}]