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': "Compared with cow's milk, mother's milk has more - \nSelect and explain. \nA. Lactose, B. Vitamin D, C. Proteins, D. Fat", 'role': 'user'}, {'content': "Answer: A \nExplanation: Lactose content in cows milk-4.4g ,breast milk-7.4g per 100grams.REF.PARK'S TEXTBOOK OF PREVENTIVE AND SOCIAL MEDICINE.Editon-21.Page no.-582 table 21", 'role': 'assistant'}]