**Core Concept**
Thrombocytopenia refers to a decrease in the number of platelets in the blood, which can lead to increased bleeding tendency. This condition can be caused by various factors, including bone marrow failure, increased platelet destruction, or splenic sequestration.

**Why the Correct Answer is Right**
The correct answer is **B. Thrombotic Thrombocytopenic Purpura (TTP)**. TTP is a rare disorder characterized by the formation of blood clots in small blood vessels throughout the body, which leads to thrombocytopenia. However, in TTP, the platelet count is typically low due to the consumption of platelets in the formation of microthrombi, but the platelet function is usually normal. This is in contrast to other conditions that cause thrombocytopenia, where platelet function is impaired.

**Why Each Wrong Option is Incorrect**
* **Option A:** Disseminated Intravascular Coagulation (DIC) is a condition that causes both thrombocytopenia and thrombosis due to the consumption of platelets and clotting factors. Therefore, it is not the correct answer.
* **Option C:** Splenic sequestration can occur in conditions such as splenic enlargement or hypersplenism, leading to thrombocytopenia. This is a valid cause of thrombocytopenia.

**Clinical Pearl / High-Yield Fact**
It's essential to remember that thrombocytopenia can be caused by a variety of factors, and a thorough evaluation is necessary to determine the underlying cause. Bone marrow examination, platelet count, and reticulocyte count can help differentiate between causes of thrombocytopenia.

**Correct Answer:** B. Thrombotic Thrombocytopenic Purpura (TTP)