**Core Concept**
The question is testing the student's knowledge of the origin of various types of cells, specifically those of B cell origin. B cells, or B lymphocytes, are a type of white blood cell that plays a crucial role in the adaptive immune system.

**Why the Correct Answer is Right**
B cells originate from the bone marrow, where they undergo maturation and differentiation. They are responsible for producing antibodies and interacting with T cells to initiate an immune response. The correct answer will be a cell type that does not originate from B cells.

**Why Each Wrong Option is Incorrect**
**Option A:** This option is incorrect because it is a type of B cell. B cells are a type of lymphocyte that originates from the bone marrow and is responsible for producing antibodies.
**Option B:** This option is incorrect because it is a type of B cell. B cells are a type of lymphocyte that originates from the bone marrow and is responsible for producing antibodies.
**Option C:** This option is incorrect because it is a type of B cell. B cells are a type of lymphocyte that originates from the bone marrow and is responsible for producing antibodies.

**Clinical Pearl / High-Yield Fact**
It is essential to remember that B cells are responsible for producing antibodies, which are crucial for neutralizing pathogens and toxins. The correct identification of B cell origin is vital in understanding various immune-related disorders.

**Correct Answer: A. Plasma cells are of B cell origin.