This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Virology, Subject name: Microbiology
[{'content': 'HIV virus can be isolated from all except - \nSelect and explain. \nA. Semen, B. Saliva, C. Blood transfusion, D. Skin scraping', 'role': 'user'}, {'content': 'Answer: D \nExplanation: HIV virus is transmitted thtough semen,saliva,blood transfusion REF:<\\p> MICROBIOLOGY ANANTHA NARAYANAN NINTH EDITION PAGE.583', 'role': 'assistant'}]