Rh factor derived its name on the basis of

Options

A. Chimpanzee
B. Gorilla
C. Rhesus monkey
D. Rat

Answer

To answer the question "Rh factor derived its name on the basis of," we can follow these steps:

### Step-by-Step Solution:

1. **Understanding Blood Groups**: Blood groups are classified based on the presence or absence of specific antigens on the surface of red blood cells. One of these antigens is known as the Rh factor.

2. **Identifying the Rh Factor**: The Rh factor is an antigen that can be present (Rh positive) or absent (Rh negative) in blood. It plays a crucial role in blood transfusions and pregnancy.

3. **Historical Context**: The Rh factor was discovered by two scientists, Karl Landsteiner and Alexander Wiener, in the year 1940. They were studying blood group systems and identified this specific antigen.

4. **Source of the Name**: The name "Rh" comes from the Rhesus monkey, which was used in their experiments. The researchers found that the antigen they identified was present in the blood of this monkey.

5. **Conclusion**: Therefore, the Rh factor derived its name from the Rhesus monkey, which is the correct answer to the question.

### Final Answer:
The Rh factor derived its name on the basis of the Rhesus monkey.

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