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': 'Milk is a poor source of which of the following? \nSelect and explain. \nA. Essential fatty acids, B. Iron, C. Vitamin C, D. Vitamin A', 'role': 'user'}, {'content': "Answer: B \nExplanation: In milk, iron is present in small amount. REF. PARK'S TEXTBOOK OF PREVENTIVE AND SOCIAL MEDICAL 21ST EDITION. PAGE NO - 582", 'role': 'assistant'}]