What means of preventing disease involved stimulating the immune system?

• A. Silk Road
• B. Camel Caravans
• C. Inoculation
• D. Cultural Exchange

Answer: (C)

Inoculation trains the body's immune system by exposing it to a small amount of a pathogen in a controlled setting, prompting the immune system to produce antibodies and memory cells. This prepares the body to fight the disease more effectively if it encounters the real pathogen later, reducing the chance of illness. Historically, inoculation was practiced in medieval China as an early form of immunization against diseases such as smallpox, laying groundwork for later vaccine approaches. The other options describe routes or means of moving people, goods, or ideas—like Silk Road, camel caravans, and cultural exchange—not a medical method to prevent disease by stimulating the immune system.