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How is a contagious disease spread?

  1. Through contaminated water only

  2. From one person to another

  3. By insects only

  4. Not applicable, diseases aren't contagious

The correct answer is: From one person to another

Contagious diseases can be spread from person to person through a variety of ways, including direct contact, respiratory droplets, and indirect contact with contaminated surfaces or objects. Contaminated water (choice A) can also be a mode of transmission for some diseases, but it is not the only way. Insects (choice C) can also transmit certain diseases, but not all contagious diseases. Therefore, B is the most accurate choice. Option D is incorrect, as there are many contagious diseases that can be transmitted from person to person.