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Polio and chicken pox are caused by:

AViruses
BBacteria
CProtozoa
DMoulds
Answer & Solution
Correct answer: A. Viruses
1. Common cold and flu are also viral. 2. Polio and chicken pox are serious viral diseases. 3. Vaccines prevent them. _Source: syllabus Science, Chapter 2, Microorganisms: Friend and Foe._
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