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': 'Rate of transmission of HIV from infected Mother to infant is \nSelect and explain. \nA. 100%, B. 66%, C. 30%, D. 5-10%', 'role': 'user'}, {'content': 'Answer: C \nExplanation: None', 'role': 'assistant'}]