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B
Viruses
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C
Skin-to-skin contact
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D
Droplet infection
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Solution
The correct option is D Viruses
Measles, mumps, rubella, and varicella (commonly known as chickenpox), influenza are the chronic diseases of a virus.
These can be prevented from spreading by using vaccines. This vaccine works by prior exposure of a small dose of the virus or a protein from the virus, which activates the immune response.