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: Medicine
[{'content': 'A blood donor is not considered for safe transfution, if he has - \nSelect and explain. \nA. Anti HBs Ag +ve, B. Anti HBs Ag and HBc Ag +ve, C. Hbs Ag +ve & IgM anti HBc +ve, D. Anti HBc +ve', 'role': 'user'}, {'content': 'Answer: C \nExplanation: None', 'role': 'assistant'}]