Assertion (A) Competitive inhibitors compete with natural substrate for their attachement on the active sites of enzymes.
Reason (R) In competitive inhibitor binds to the allosteric site of the enzyme.

Options

A. Assertion and reason both are correct statements but reason does not explain assertion.
B. Assertion and reason both are correct and reason explains the assertion.
C. Both assertion and reason are wrong statements.
D. Assertion is correct statement reason is wrong statement.

Explanation

To analyze the assertion and reason provided in the question, we will break down the concepts step by step.

### Step-by-Step Solution:

1. **Understanding the Assertion (A)**:
- The assertion states that "Competitive inhibitors compete with natural substrate for their attachment on the active sites of enzymes."
- Competitive inhibitors are molecules that resemble the natural substrate of an enzyme. They bind to the active site of the enzyme, thereby preventing the natural substrate from attaching to the enzyme. This competition can decrease the rate of the reaction catalyzed by the enzyme.

2. **Understanding the Reason (R)**:
- The reason states that "In competitive inhibitor binds to the allosteric site of the enzyme."
- This statement is incorrect. Competitive inhibitors bind specifically to the active site of the enzyme, not the allosteric site. The allosteric site is a different location on the enzyme where non-competitive inhibitors can bind, but this does not apply to competitive inhibitors.

3. **Conclusion**:
- Since the assertion is true (competitive inhibitors do compete with the substrate at the active site) and the reason is false (competitive inhibitors do not bind to the allosteric site), we conclude that the assertion is correct while the reason is incorrect.

### Final Answer:
- Assertion (A) is true.
- Reason (R) is false.
- Therefore, the correct relationship is that the assertion is true, but the reason is false.