**Core Concept**
Rheumatoid arthritis (RA) is a chronic autoimmune disorder that can lead to anemia due to chronic inflammation, bone marrow suppression, and altered iron metabolism. The type of anemia seen in RA is often related to the underlying pathophysiology of the disease.

**Why the Correct Answer is Right**
The type of anemia seen in RA is typically a normocytic, normochromic anemia, which is characterized by a decrease in the production of red blood cells (RBCs) due to bone marrow suppression. This is often due to the production of cytokines, such as tumor necrosis factor-alpha (TNF-alpha) and interleukin-1 (IL-1), which can inhibit the production of erythropoietin (EPO) and lead to a decrease in RBC production. Additionally, chronic inflammation in RA can lead to increased hepcidin levels, which can cause a decrease in iron availability for RBC production.

**Why Each Wrong Option is Incorrect**
* **Option A:** This option is incorrect because anisocytic anemia is typically seen in conditions such as thalassemia, where there is a mutation in the hemoglobin gene.
* **Option B:** This option is incorrect because microangiopathic hemolytic anemia is typically seen in conditions such as thrombotic thrombocytopenic purpura (TTP), where there is a destruction of RBCs due to mechanical damage.
* **Option D:** This option is incorrect because sideroblastic anemia is typically seen in conditions such as lead poisoning, where there is a defect in the production of heme.

**Clinical Pearl / High-Yield Fact**
It's essential to note that anemia in RA can be multifactorial, and a thorough evaluation of the patient's iron status, vitamin B12 levels, and erythropoietin levels is necessary to determine the underlying cause of anemia.

**Correct Answer: C. Normocytic, normochromic anemia.**