The answer is the second one (B): peptic ulcer -- bacteria.
Explanation for each option:
Dental caries -- protozoan: This is incorrect. Dental caries are caused by bacteria, primarily Streptococcus mutans, not protozoans.
Peptic ulcer -- bacteria: This is correct. Peptic ulcers are often caused by the bacterium Helicobacter pylori.
Botulism -- virus: This is incorrect. Botulism is caused by a toxin produced by the bacterium Clostridium botulinum, not a virus.
Cholera -- fungus: This is incorrect. Cholera is caused by the bacterium Vibrio cholerae, not a fungus.
In summary, the correct pairing is peptic ulcer with bacteria.
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