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Common cold, influenza, dengue fever and AIDS are caused by:

AViruses
BBacteria
CProtozoa
DMoulds
Answer & Solution
Correct answer: A. Viruses
1. Typhoid and cholera are bacterial. 2. Cold, flu, dengue and AIDS are viral. 3. Antibiotics do not help against them. _Source: syllabus Science, Chapter 13, Why Do We Fall Ill._
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