**Core Concept**
The transmission of malaria from mosquitoes to humans involves the transfer of a specific parasite stage through the saliva of the infected mosquito. The parasite undergoes a complex life cycle involving two hosts, the mosquito and the human.

**Why the Correct Answer is Right**
The correct answer is the sporozoite, which is the infectious stage of the malaria parasite that is transmitted to humans through the bite of an infected mosquito. The sporozoites are injected into the human bloodstream when the mosquito feeds, and they then migrate to the liver where they undergo asexual reproduction. This is the initial stage of the malaria infection in humans. The liver cells are invaded by the sporozoites, which then multiply and release merozoites that infect red blood cells.

**Why Each Wrong Option is Incorrect**
**Option A:** The ookinete is a stage of the malaria parasite that develops in the midgut of the mosquito after the ingestion of infected blood. It is not the stage that is transmitted to humans through mosquito bites.
**Option B:** The gametocyte is a stage of the malaria parasite that is found in the bloodstream of infected individuals and is ingested by mosquitoes during feeding. It is not the stage that is transmitted to humans through mosquito bites.
**Option C:** The hypnozoite is a dormant stage of the malaria parasite that can remain in the liver cells of infected individuals for extended periods. It is not the stage that is transmitted to humans through mosquito bites.

**Clinical Pearl / High-Yield Fact**
It's essential to note that the transmission of malaria can be prevented by using insecticide-treated bed nets, wearing protective clothing, and applying insect repellents. Additionally, the use of antimalarial medications can help prevent the development of the disease in individuals who have been bitten by an infected mosquito.

**Correct Answer:** C. Sporozoite