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: Microbiology
[{'content': 'HIV is transmitted by all of the following routes\nexcept \nSelect and explain. \nA. Saliva, B. Needle prick injury, C. Blood transmission, D. Sexual intercourse', 'role': 'user'}, {'content': 'Answer: A \nExplanation: None', 'role': 'assistant'}]