Many bacteria in our digestive system synthesize vitamins for example vitamin_________?
Correct answer: C. B12
- A. B1
- B. B2
- C. B12
- D. B6
Explanation
Intestinal bacteria can synthesize several B-group vitamins, including vitamin B12, which is also important for red blood cell formation and nervous-system function. Students may choose B1 because gut bacteria can produce some thiamine, but B12 is the standard example asked in this context.
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