The correct answer is option 1: Cholera. Cholera is not caused by a virus, but by the bacteria Vibrio cholerae. Cholera is a contagious disease that spreads through the consumption of contaminated food or water. The bacteria multiply in the small intestine and release a toxin that causes diarrhea and dehydration in infected individuals.

Option 2: Chickenpox is caused by the varicella-zoster virus. It is highly contagious and mainly affects children. The virus spreads through direct contact with the fluid from the blisters of an infected person.

Option 3: Hepatitis can be caused by several viruses, such as hepatitis A, B, C, D, and E viruses. These viruses primarily affect the liver and can cause inflammation and liver damage.

Option 4: Measles is caused by the measles virus. It is a highly contagious respiratory infection. It spreads through respiratory droplets from an infected person and can cause fever, cough, rash, and other symptoms.

Alert - The correct answer should be option 1: Cholera.