Assertion: First seven pairs of ribs are called true ribs.
Reason: These ribs are not connected ventrally to the sternum.

Options

A. If both assertion and reason are ture and reason is the corect explanation of assertion
B. If both assertion and reason are ture but reson is not the correct explanation of assertion
C. If assertion is true reason is false
D. If both assertion and reason are false

Explanation

To solve the question regarding the assertion and reason about ribs, we can break it down into a step-by-step analysis:

### Step-by-Step Solution:

1. **Understanding the Assertion**:
- The assertion states that the first seven pairs of ribs are called true ribs.
- True ribs are defined as the ribs that are directly attached to the sternum.

2. **Evaluating the Assertion**:
- In human anatomy, the first seven pairs of ribs (ribs 1 to 7) are indeed connected to the sternum through a type of cartilage known as hyaline cartilage.
- Therefore, the assertion is **true**.

3. **Understanding the Reason**:
- The reason states that these ribs are not connected ventrally to the sternum.
- "Ventrally" refers to the front side of the body, which in this context means the ribs should be connected to the sternum.

4. **Evaluating the Reason**:
- Since the true ribs (first seven pairs) are directly connected to the sternum, the statement that they are not connected ventrally is **false**.

5. **Conclusion**:
- The assertion is true, but the reason is false.
- Therefore, the correct answer is that the assertion is correct, but the reason is incorrect.

### Final Answer:
- The assertion is true, and the reason is false. The correct option is **C**.

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