Choice A rationale:

Using mosquito nets while sleeping is an effective preventive measure against mosquito-borne infections like Zika. It helps protect individuals from mosquito bites during sleep, when they are most vulnerable.

Choice B rationale:

Applying sunscreen to exposed skin is essential for protecting against sunburn and skin damage, but it does not prevent Zika virus infection, which is transmitted through mosquito bites.

Choice C rationale:

Eliminating standing water to reduce mosquito breeding sites is crucial for controlling the mosquito population. Mosquitoes breed in stagnant water, and by eliminating these breeding sites, the mosquito population decreases, reducing the risk of Zika transmission.

Choice D rationale:

Avoiding sexual contact with partners who traveled to Zika transmission areas is important because Zika can be sexually transmitted. Infected individuals can transmit the virus to their sexual partners, leading to potential spread of the infection.

Choice E rationale:

Consuming unpasteurized dairy products for immunity boost is not a preventive measure against Zika virus infection. There is no evidence to suggest that unpasteurized dairy products can protect against Zika, and consuming them can pose other health risks due to potential contamination with harmful pathogens.

Measles.