This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Bacteriology, Subject name: Microbiology
[{'content': 'Bacilli Calmette Guerin contains the avirulent strains of \nSelect and explain. \nA. Human tubercle bacilli, B. An tubercle bacilli, C. Bovine tubercle bacilli, D. Atypical mycobacteria', 'role': 'user'}, {'content': 'Answer: C \nExplanation: BCG is produced from strain Mycobacterium bovis Ref: Harrison&;s Principles of Internal Medicine; 19th edition; Chapter 202; Tuberculosis', 'role': 'assistant'}]