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The bacterium (Clostridium botulinum) that causes botulism is

1. an obligate anaerobe
2. a facultative aerobe
3. an obligate aerobe
4. a facultative anaerobe

Correct answer: an obligate anaerobe

Solution

Clostridium botulinum is a strict anaerobe, meaning it grows only when oxygen is absent. That is why the correct choice is the option describing an obligate anaerobe.

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