Post-disaster conditions promote waterborne, vector-borne, and respiratory infections

Steps:

• Identify risks: Sewage contamination spreads waterborne diseases like cholera (disease 1).
• Note flooding: Stagnant pools breed mosquitoes, increasing vector-borne diseases like malaria (disease 2).
• Consider overcrowding: Close quarters facilitate respiratory infections like measles (disease 3).
• Conclude all three diseases rise due to combined environmental and social disruptions.

Why A is correct:

• Earthquake and rain create ideal conditions for all three disease types, as defined by WHO post-disaster epidemiology linking contamination, vectors, and crowding to outbreaks.

Why the others are wrong:

• B: Excludes malaria, but flooding directly boosts mosquito populations.
• C: Ignores malaria and measles, both amplified by water pools and crowding.
• D: Omits cholera, despite clear sewage-water contamination pathway.

Final answer: A