[A]: The deleted region of long arm of chro- mosome 7 contains the elastin gene.
[R]: Deletion of long arm of chromosome 7 results in Cri du Chat syndrome

Options

A. If both A and R are true and R is the correct explanation of A
B. If both A and R are true but R is not the correct explanation of A
C. If A is true and R is false
D. If both A and R are false

Answer

To solve the question, we need to analyze the statements provided about chromosome 7 and the associated syndromes.

### Step-by-Step Solution:

1. **Understanding Statement [A]**:
- The statement claims that the deleted region of the long arm of chromosome 7 contains the elastin gene.
- The elastin gene is indeed located on chromosome 7, specifically on the long arm (7q). This gene is crucial for the production of elastin, a protein that gives elasticity to various tissues in the body.

**Hint**: Identify the location of the elastin gene and its role in the body.

2. **Understanding Statement [R]**:
- The reason states that deletion of the long arm of chromosome 7 results in Cri du Chat syndrome.
- Cri du Chat syndrome is actually caused by a deletion on the short arm of chromosome 5 (5p). This syndrome is characterized by a high-pitched cry in infants, which is where the name "cat cry syndrome" comes from.

**Hint**: Confirm the chromosome and arm associated with Cri du Chat syndrome.

3. **Evaluating the Truth of Each Statement**:
- Statement [A] is true because the elastin gene is located on the long arm of chromosome 7.
- Statement [R] is false because Cri du Chat syndrome is linked to a deletion on chromosome 5, not chromosome 7.

**Hint**: Cross-check the information about the syndromes and their genetic causes.

4. **Conclusion**:
- Based on the evaluations, we conclude that statement [A] is true and statement [R] is false. Therefore, the correct answer is that [A] is true and [R] is false.

**Hint**: Summarize the findings to clarify the relationship between the statements.

### Final Answer:
- [A] is true and [R] is false.