**Core Concept**
Hemolytic anemia is a condition characterized by the premature destruction of red blood cells (RBCs), leading to a decrease in the body's red blood cell mass and a subsequent increase in bilirubin levels. This condition can be caused by various factors, including autoimmune disorders, infections, and genetic mutations.

**Why the Correct Answer is Right**
The correct answer is related to the features of hemolytic anemia. Hemolytic anemia is typically characterized by a combination of laboratory findings, including:
* Increased indirect bilirubin levels due to the breakdown of RBCs.
* Elevated lactate dehydrogenase (LDH) levels, as this enzyme is released from damaged RBCs.
* Decreased haptoglobin levels, as this protein binds to free hemoglobin released from lysed RBCs.
* Increased reticulocyte count, indicating an attempt by the bone marrow to compensate for the loss of RBCs.

**Why Each Wrong Option is Incorrect**
**Option A:** This feature is incorrect because hemolytic anemia is not typically characterized by an increase in mean corpuscular volume (MCV). In fact, many cases of hemolytic anemia are associated with normocytic or microcytic anemia.
**Option B:** This feature is incorrect because hemolytic anemia is often associated with an increased risk of infections, particularly those caused by encapsulated bacteria. This is due to the decreased ability of the spleen to filter out these pathogens.
**Option C:** This feature is incorrect because hemolytic anemia is not typically associated with an increased risk of bleeding. In fact, the increased bilirubin levels and decreased haptoglobin levels can lead to a condition known as hemolytic jaundice.

**Clinical Pearl / High-Yield Fact**
In cases of hemolytic anemia, it is essential to consider the underlying cause and the potential for splenomegaly (enlarged spleen) and portal hypertension. A thorough physical examination and laboratory workup, including a complete blood count (CBC) and reticulocyte index, can help guide diagnosis and management.

**Correct Answer: D. An increase in mean corpuscular volume (MCV)**