## **Core Concept**
Malaria is a mosquito-borne infectious disease affecting humans, caused by parasitic protozoa of the genus *Plasmodium*. The disease primarily affects the **red blood cells** and can have systemic implications, impacting various organs. Understanding the pathophysiology of malaria is crucial for identifying which organs are typically affected.

## **Why the Correct Answer is Right**
The correct answer, , implies that the organ listed is not typically affected by malaria. Malaria primarily affects the **red blood cells**, liver (during the initial stages with *Plasmodium vivax* and *Plasmodium ovale*), spleen, brain (in severe cases with *Plasmodium falciparum*), and other organs indirectly due to anemia and immune response.

## **Why Each Wrong Option is Incorrect**
- **Option A:** The liver is involved in the initial stages of infection with certain types of *Plasmodium*, such as *P. vivax* and *P. ovale*, where the parasites form **hypnozoites** that can remain dormant.
- **Option B:** The spleen is commonly affected, often becoming **enlarged** due to the accumulation of infected red blood cells and the immune response.
- **Option D:** The brain can be affected in severe malaria, particularly with *P. falciparum*, leading to **cerebral malaria**, a life-threatening condition.

## **Clinical Pearl / High-Yield Fact**
A key point to remember is that *P. falciparum* malaria can cause **severe organ dysfunction**, including cerebral malaria, severe anemia, and acute kidney injury, due to its ability to cause high levels of parasitemia and sequestration of infected red blood cells in vital organs.

## **Correct Answer:** . Bone marrow