This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Communicable diseases, Subject name: Social & Preventive Medicine
[{'content': 'Which of the following may not be used as candidate vaccine(s) in Leprosy \nSelect and explain. \nA. BCG Vaccine, B. Killer M.leprae + BCG Vaccine, C. M.indicus pranii, D. BCG Vaccine + M.vaccae', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Leprosy Vaccine Trials BCG Mycobacterium bovis (India) BCG plus Killed Mycobacterium leprae (India) Mycobacterium w MIP Mycobacterium Indicus Pranii (India) ICRC/Indian Cancer Research Centre bacilli (India) Mycobacterium Habana Mycobacterium vaccae (Vietnam) Ref: Essential of microbiology by Kumar 1st edition Pgno : 245', 'role': 'assistant'}]