Physical , psychromotor and mental development is retarded in an individual affected with

Options

A. Down's syndrome
B. Sickle cell anaemia
C. Turner's syndrome
D. Colour blindness

Answer

To solve the question regarding which condition is characterized by physical, psychomotor, and mental development retardation, we can follow these steps:

### Step-by-Step Solution:

1. **Understand the Question**: The question asks about a condition that leads to retardation in physical, psychomotor, and mental development. This indicates a developmental disorder.

2. **Analyze the Options**: We have four options to consider:
- A) Down syndrome
- B) Sickle cell anemia
- C) Turner syndrome
- D) Colorblindness

3. **Evaluate Each Option**:
- **Option A: Down syndrome**: This condition is caused by trisomy of the 21st chromosome. It is known to cause mental retardation along with physical and psychomotor developmental delays. It also has characteristic features such as epicanthic folds.
- **Option B: Sickle cell anemia**: This is an autosomal disorder primarily affecting the shape of red blood cells. It does not typically cause mental retardation.
- **Option C: Turner syndrome**: This condition involves aneuploidy of the X chromosome, leading to monosomy (missing one X chromosome). The main symptoms include sterility and underdeveloped ovaries, not mental retardation.
- **Option D: Colorblindness**: This is an X-linked disorder related to the inability to perceive colors correctly. It does not involve mental retardation.

4. **Identify the Correct Answer**: Based on the analysis, Down syndrome (Option A) is the only condition that is primarily associated with retardation in physical, psychomotor, and mental development.

5. **Conclusion**: The correct answer to the question is **Option A: Down syndrome**.