Assertion `:` If the muscles of both auricles of the person permanently fail to contract due to any reason there will still be no change in his general condition at rest.
Reason `: 75%` of the amount of blood transferred from auricles to ventricles is during auricular diastole.

Options

A. If both Assertion & Reason are True & the Reason is a correct explanation of the Assertion .
B. If both Assertion & Reason are True but Reason is not a correct explanation of the Assertion
C. If Assertion is True but the Reason is False.
D. If both Assertion & Reason are false.

Answer

To solve the question regarding the assertion and reason, we will analyze both statements step by step.

### Step 1: Analyze the Assertion
The assertion states that if the muscles of both auricles fail to contract permanently, there will be no change in the person's general condition at rest.

- **Understanding the Role of Auricles**: The auricles (or atria) are responsible for receiving blood from the body and lungs and then pushing it into the ventricles. They contract to help move blood into the ventricles.
- **Implication of Failure**: If the auricles cannot contract, one might think that blood flow would be severely affected. However, the heart has mechanisms that allow it to function even if the auricles are not contracting effectively.

**Conclusion on Assertion**: The assertion is **false** because the failure of the auricles to contract would likely lead to changes in the person's condition, especially during physical activity, as the ventricles would not receive adequate blood volume.

### Step 2: Analyze the Reason
The reason states that 75% of the blood transferred from the auricles to the ventricles occurs during auricular diastole.

- **Understanding Diastole**: During diastole, the heart muscle relaxes, and the ventricles fill with blood. The auricles also fill with blood during this phase.
- **Role of Diastole**: It is true that a significant portion of blood flows from the auricles to the ventricles during diastole, but this does not negate the importance of auricular contraction in ensuring efficient blood flow.

**Conclusion on Reason**: The reason is **true** in terms of the percentage of blood flow during diastole, but it does not adequately explain why the assertion is correct or incorrect.

### Final Conclusion
- **Assertion**: False
- **Reason**: True
- Since the assertion is false and the reason is true, the correct option is that the assertion is false, and the reason is true.