This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: All India exam, Subject name: Medicine
[{'content': 'Hepatitis B virus is NOT present in \nSelect and explain. \nA. Milk, B. Sweat, C. Stool, D. Lymph', 'role': 'user'}, {'content': "Answer: D \nExplanation: (ref: Harrison's 18/e p2108)", 'role': 'assistant'}]