The correct option is B Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion
The plant Pentadiplandra brazzeana, also know as Oubli is found in west Africa. It produces a sweet protein called Brazzein. Hence, the assertion is correct.
The protein Brazzein is a low-calorie sweetener and is heat stable and thus, used for the treatment of diabetes. Hence, the reason is correct.
Both assertion and reason are correct but the reason is not the correct explanation for the assertion.
So, the correct answer is B.