Malaria Control Targets Vector and Parasite

Steps:

• Malaria pathogen is Plasmodium parasite, transmitted by Anopheles mosquitoes; control focuses on interrupting transmission via vector reduction and parasite treatment.
• Releasing carnivorous fish eats mosquito larvae in water bodies, reducing vector breeding: effective.
• Applying antibiotic creams targets bacteria, ineffective against protozoan parasite: not useful.
• Spraying insecticides on buildings kills resting adult mosquitoes via residual action: effective vector control.
• Vaccination with malaria vector (mosquito) lacks evidence; approved vaccines like RTS,S target parasite antigens, not vector.

Why A is correct:

• Aligns with WHO-recommended strategies: biological (fish) and chemical (insecticides) vector control, excluding irrelevant antibiotics and nonexistent vector vaccine.

Why the others are wrong:

• B: Falsely endorses antibiotics (ineffective on parasites) and vector vaccination (not a method), rejects proven vector controls.
• C: Blank option provides no information for evaluation.
• D: Incorrectly accepts vector vaccination while rejecting fish for larvae control.

Final answer: A