Which is the non-contagious disease that is the most common in the world?
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Tooth Decay
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AIDS
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Swine-Flu
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Common cold
A
Correct answer
Explanation
Tooth decay (dental caries) is indeed one of the most common chronic diseases worldwide, affecting people of all ages. The other options are all contagious/communicable diseases: AIDS is caused by HIV transmission, Swine Flu (H1N1) is a viral influenza, and the common cold is viral. Non-contagious diseases cannot spread from person to person.