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
Gas gangrene bacilli is: September 2004 
Select and explain. 
A. Facultative anaerobe, B. Obligate anaerobe, C. Facultative aerobe, D. Obligate aerobe
B: Obligate anaerobe
Answer: B: Obligate anaerobe 
Explanation: Ans. B i.e. Obligate anaerobe