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': "Amount of protein in 100 ml of cow's milk is: \nSelect and explain. \nA. 1 g, B. 3 g, C. 4 g, D. 4.5 g", 'role': 'user'}, {'content': "Answer: B \nExplanation: Amount per 100 ml Cow's milk Human milk Fat 3.8 g 3.7 g Protein 3.3 g 1.1 g Lactose 4.5 g 7 g Ref: Nutrition and Child Development, K.E. Elizabeth, 4th edition pg: 18", 'role': 'assistant'}]