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
Bacilli Calmette Guerin contains the avirulent strains of 
Select and explain. 
A. Human tubercle bacilli, B. An tubercle bacilli, C. Bovine tubercle bacilli, D. Atypical mycobacteria
C: Bovine tubercle bacilli
Answer: C: Bovine tubercle bacilli 
Explanation: BCG is produced from strain Mycobacterium bovis Ref: Harrison&;s Principles of Internal Medicine; 19th edition; Chapter 202; Tuberculosis