**Core Concept**
Transfusion-related malaria occurs when an individual receives blood or blood products contaminated with the infective forms of the malaria parasite. This can lead to the development of malaria in a previously non-immune individual. The infective forms of the parasite are transmitted through the bite of an infected mosquito, but in this context, it is through the transfusion of infected blood products.

**Why the Correct Answer is Right**
The infective form of the malaria parasite that causes transfusion-related malaria is the sporozoite. Sporozoites are the stage of the parasite that is injected into the host when an infected mosquito bites. In the case of transfusion-related malaria, sporozoites are transmitted through the transfusion of infected blood products. These sporozoites then invade the liver cells and begin the infection process. The liver stages of the parasite, including the sporozoites, are responsible for the incubation period of the disease.

**Why Each Wrong Option is Incorrect**
**Option A:** Not relevant to transfusion-related malaria
**Option B:** Not accurate for the infective form in transfusion-related malaria
**Option C:** Not applicable to the context of transfusion-related malaria

**Clinical Pearl / High-Yield Fact**
It is essential for blood banks and transfusion services to screen blood products for malaria parasites, particularly in areas where malaria is endemic. This can be done through serological tests or molecular diagnostic techniques.

**Correct Answer: C. Sporozoite. Sporozoites are the infective form of the malaria parasite that causes transfusion-related malaria.**