**Core Concept**
Microangiopathic hemolytic anemia (MAHA) is characterized by the mechanical destruction of red blood cells due to the obstruction of small blood vessels, leading to the formation of schistocytes (fragmented red blood cells) and thrombocytopenia.

**Why the Correct Answer is Right**
MAHA is a common feature of thrombotic thrombocytopenic purpura (TTP), a disorder caused by the deficiency of ADAMTS13, a metalloprotease that cleaves von Willebrand factor (VWF) into smaller fragments. In TTP, the accumulation of ultra-large VWF multimers leads to microvascular thrombi formation, resulting in MAHA. MAHA is also a key component of hemolytic uremic syndrome (HUS), a condition often associated with Shiga toxin-producing E. coli infections. In HUS, the toxin damages the endothelial cells lining the small blood vessels, leading to the activation of the coagulation cascade and MAHA.

**Why Each Wrong Option is Incorrect**
**Option A:** MAHA is indeed a feature of TTP, so this option is incorrect.
**Option C:** MAHA is also a common feature of HUS, making this option incorrect as well.

**Clinical Pearl / High-Yield Fact**
MAHA can be caused by a variety of conditions, including mechanical heart valves, cancer, and autoimmune disorders like systemic lupus erythematosus. A high index of suspicion and prompt recognition of MAHA are crucial in managing these patients, as timely intervention can significantly improve outcomes.

**Correct Answer:** D.