**Core Concept**
Rituximab is a **monoclonal antibody** that targets the **CD20 antigen** found on the surface of **B cells**, leading to their depletion. It is used in the treatment of various conditions, including **non-Hodgkin's lymphoma**, **rheumatoid arthritis**, and **chronic lymphocytic leukemia**.

**Why the Correct Answer is Right**
Since the options are missing, let's discuss the general use of Rituximab. Rituximab works by binding to the **CD20 antigen** on **B cells**, causing **cell lysis** and **apoptosis**. This mechanism is effective in treating **B cell-related disorders**.

**Why Each Wrong Option is Incorrect**
**Option A:** Without the specific option, it's challenging to provide a detailed explanation.
**Option B:** Similarly, without the option, we cannot determine its correctness.
**Option C:** The same applies here.
**Option D:** This option's correctness cannot be assessed without its content.

**Clinical Pearl / High-Yield Fact**
Rituximab's use in **autoimmune hemolytic anemia** and **immune thrombocytopenia** is notable, as it helps reduce **B cell** production of **autoantibodies**.

**Correct Answer:** D. Multiple sclerosis