**Core Concept**
The question tests the student's knowledge of transfusion medicine, specifically the potential side effects of blood transfusion. Blood transfusions can lead to various adverse reactions, ranging from mild to life-threatening.

**Why the Correct Answer is Right**
Although the options are not provided, common side effects of blood transfusion include febrile non-hemolytic transfusion reactions, allergic reactions, and hemolytic transfusion reactions. The correct answer would be a condition unrelated to blood transfusion or an unlikely consequence of transfusion.

**Why Each Wrong Option is Incorrect**
**Option A:** Would be incorrect if it listed a known common side effect like a febrile non-hemolytic reaction.
**Option B:** Might be wrong if it mentioned an allergic reaction, which can occur due to transfusion.
**Option C:** Could be incorrect if it stated a hemolytic transfusion reaction, a serious complication of transfusion.

**Clinical Pearl / High-Yield Fact**
A key point to remember is that hemolytic transfusion reactions can be severe and are often due to ABO incompatibility.

**Correct Answer:** Correct Answer: D. Hypercalcemia.