The disease that might be prevented by not sharing a water bottle is mononucleosis, which spreads through saliva. By avoiding sharing drinks, you can reduce the risk of contracting this viral infection. Therefore, the best answer is A. Mononucleosis.
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Mononucleosis is a disease that can be transmitted through saliva, which makes sharing a water bottle potentially risky. Unlike salmonella poisoning, conjunctivitis, and dental issues, mononucleosis is specifically spread through shared drinks. Therefore, avoiding sharing water bottles can help prevent this infection. ;