Assertion:The 8th , 9th and 10th pairs of ribs are false ribs
Reason:They are attached to the lumbar vertebrae dorsally

Options

A. if both assertion and reason are true and the reason is correct explanton of Assertion
B. IF both assertion and reason and reason are true but reason is not a correct explanation of assertion
C. IF assertion is true and reason is wrong
D. if both assertion and reason are wrong

Answer

To solve the question regarding the assertion and reason about the ribs, follow these steps:

### Step 1: Understand the Assertion
The assertion states that the 8th, 9th, and 10th pairs of ribs are false ribs.

**Explanation**:
- False ribs are defined as ribs that do not attach directly to the sternum.
- The 8th, 9th, and 10th pairs of ribs are indeed classified as false ribs because they connect to the 7th rib via costal cartilage rather than directly to the sternum.

### Step 2: Understand the Reason
The reason provided states that these ribs are attached to the lumbar vertebrae dorsally.

**Explanation**:
- This statement is incorrect. The 8th, 9th, and 10th pairs of ribs do not attach to the lumbar vertebrae. Instead, they are attached to the thoracic vertebrae.
- The lumbar vertebrae are located lower in the back and do not have any direct connection with the ribs.

### Step 3: Analyze the Relationship Between Assertion and Reason
Now we need to determine if the reason correctly explains the assertion.

**Conclusion**:
- The assertion is true (the 8th, 9th, and 10th ribs are false ribs).
- The reason is false (they are not attached to the lumbar vertebrae).

### Step 4: Choose the Correct Option
Based on the analysis:
- The assertion is true, and the reason is false.
- Therefore, the correct answer is that the assertion is true, and the reason is false.

### Final Answer
The correct answer is: **Option 3** - Assertion is true, and reason is false.

---