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The bacterium (Clostridium botulinum) that causes botulism is
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- an obligate anaerobe
- an facultative aerobe
- an obligate aerobe
- a facultative anaerobe
Correct Option: A
Clostridium botulinum is an obligate anaerobe i.e. it normally lives in the absence of oxygen. Facultative anaerobes are those who generally live in oxygen but may live without oxygen in suitable medium. Obligate aerobes can only live in the presence of oxygen while facultative aerobes generally live in oxygen but can also live without oxygen.