Verifying statements on cholera, measles, and smallpox

Steps:

• Check statement 1: Confirm cholera's cause (Vibrio cholerae bacterium) and vaccine availability (Dukoral and Vaxchora exist).
• Check statement 2: Confirm measles' cause (Morbillivirus in Paramyxoviridae family) and vaccine (MMR vaccine effective).
• Check statement 3: Confirm smallpox eradication (via WHO vaccination campaign in 1980) but identify cause (variola virus, not bacteria).
• Determine correct statements: 1 and 2 accurate, 3 incorrect due to viral pathogen.

Why A is correct:

• A selects statements 1 and 2, matching verified facts on cholera (bacterial, vaccinated) and measles (viral Morbillivirus, vaccinated).

Why the others are wrong:

• B includes 3, false because smallpox is viral (Variola virus), not bacterial.
• C includes 3, false for same viral reason.
• D omits 1, incorrect as cholera is bacterial Vibrio with available vaccine.

Final answer: A