Which of the following diseases is best represented by a person sneezing or coughing into a tissue?

The diagram shows a person sneezing or coughing into a tissue. This action is characteristic of diseases that spread through respiratory droplets in the air.

• A. a waterborne disease: Spread through contaminated water.
• B. a non-communicable disease: Not spread from person to person.
• C. an airborne disease: Spread through the air via droplets.
• D. a congenital disease: Present from birth. The symptoms shown are consistent with an airborne disease. The person illustrated in the diagram could have been infected with $\boxed{\text{C. an airborne disease}}$

The material labeled X is a tissue being used by the person while sneezing or coughing. The purpose of using a tissue in this manner is to contain the respiratory droplets.

• A. provide treatment for the infection: Tissues do not treat infections.
• B. provide relief for the person: While it may offer some comfort, this is not its primary public health function.
• C. reduce the infection in the person: Tissues do not reduce the infection within the person's body.
• D. reduce spread of the infection: By catching the droplets, the tissue prevents them from becoming airborne and infecting others. The function of the material labelled X is to $\boxed{\text{D. reduce spread of the infection}}$

Question 42 asks what vaccination of infants against diseases would lead to. Vaccination works by introducing antigens to the body, which stimulates the immune system to produce specific antibodies and memory cells.

• A. destruction of pathogens: This is what antibodies achieve upon subsequent exposure to pathogens, but vaccination primarily leads to the production of these protective elements.
• B. decrease in volume of blood: This is incorrect.
• C. more active form of immunity: This is a general outcome, as the body becomes better equipped to fight future infections.
• D. producing antibodies: This is the direct physiological response to vaccination, where the immune system generates specific antibodies. This production of antibodies is the mechanism by which active immunity is conferred. Between C and D, "producing antibodies" is the most direct and fundamental physiological event that vaccination leads to. Vaccination of infants against diseases would lead to $\boxed{\text{D. producing antibodies}}$