TB Caused by Mycobacterium tuberculosis via Airborne Transmission

Steps:

• Identify TB's pathogen as Mycobacterium tuberculosis (option 1).
• Recall primary transmission through airborne droplets from coughing/sneezing (option X).
• Match to choices: A pairs 1 with wrong method W (e.g., waterborne); B pairs correctly with X.
• Eliminate mismatches: C uses wrong pathogen 2; D uses 3 and Y (e.g., vector-borne).

Why B is correct:

• Mycobacterium tuberculosis (1) is the bacterium defined by WHO as TB's sole pathogen, transmitted via respiratory aerosols (X), per standard microbiology.

Why the others are wrong:

• A: W likely waterborne, but TB isn't spread by water.
• C: Pathogen 2 (e.g., virus) doesn't cause TB.
• D: Pathogen 3 (e.g., fungus) and Y (e.g., foodborne) mismatch TB's bacterial airborne nature.

Final answer: B