**Core Concept**
In left ventricular failure, the inability of the left ventricle to pump blood efficiently leads to a backup of blood into the lungs, causing pulmonary congestion. This condition is a direct result of the left ventricle's failure to maintain adequate cardiac output.

**Why the Correct Answer is Right**
The first organ to be affected in left ventricular failure is the liver. As the right heart fails to pump blood efficiently, blood accumulates in the liver, causing congestion and hepatomegaly. This is due to the increased pressure in the hepatic veins, which leads to fluid accumulation in the pericardial space. The liver's inability to clear blood efficiently results in the release of various substances into the bloodstream, including bilirubin, which causes jaundice.

**Why Each Wrong Option is Incorrect**
* **Option A:** The kidneys are affected in right ventricular failure, not left ventricular failure.
* **Option B:** The spleen is not directly affected in left ventricular failure.
* **Option C:** The pancreas is not the first organ to be affected in left ventricular failure.

**Clinical Pearl / High-Yield Fact**
In left ventricular failure, the liver's congestion can lead to the release of various substances into the bloodstream, including bilirubin, which causes jaundice.

**Correct Answer:** D.