Distinguishing infectious from non-infectious diseases

Steps:

• Infectious diseases are caused by pathogens such as viruses, bacteria, or parasites and can spread between people.
• Non-infectious diseases include genetic disorders like sickle cell anemia and cancers like lung cancer, which do not spread via pathogens.
• Eliminate options containing any non-infectious diseases: A and D both include lung cancer and sickle cell anemia.
• Verify remaining options: B lists three infectious diseases but omits HIV/AIDS; C lists four all caused by pathogens.

Why C is correct:

• All in C are infectious per the definition: HIV/AIDS (virus), malaria (parasite), measles (virus), tuberculosis (bacteria).

Why the others are wrong:

• A: Includes non-infectious lung cancer and sickle cell anemia.
• B: Omits HIV/AIDS, making an incomplete list.
• D: Includes non-infectious lung cancer and sickle cell anemia.

Final answer: C