Royal disease

Options

A. Color blindness
B. Haemophilia
C. Mongolism
D. DMD

Answer

### Step-by-Step Solution:

1. **Understanding the Term "Royal Disease":**
- The term "royal disease" refers to a hereditary condition that has been historically associated with royal families, particularly in Europe.

2. **Identifying the Options:**
- The options provided are:
- Color blindness
- Hemophilia
- Mongolism
- DMD (Duchenne Muscular Dystrophy)

3. **Analyzing the Characteristics of the Disease:**
- The royal disease is described as a congenital hereditary coagulation disorder. This means it is a genetic condition that affects the blood's ability to clot.

4. **Historical Context:**
- This disease was notably found in the royal European family, particularly associated with Queen Victoria of England, who was a carrier of the condition.

5. **Determining the Correct Disease:**
- Among the options, hemophilia is known to be a blood disorder that affects clotting. It fits the description of a congenital hereditary coagulation disorder.
- Color blindness is a vision disorder, mongolism (now referred to as Down syndrome) is a genetic condition related to chromosome abnormalities, and DMD is a muscular disorder. None of these are related to blood coagulation.

6. **Conclusion:**
- Based on the analysis, the correct answer to the question "Royal disease is" is **hemophilia**.