Select the option that is true regarding the following two statements labelled Assertion and Reason. Assertion (A): The greatest Greek physician Hippocrates and his famous oath, the "Hippocratic oath" have become the keystone of medical ethics. Reason (R): It sets a high moral standard for the medical profession and demands absolute integrity of doctors.

Correct option is A

Assertion (A) is true. Hippocrates, known as the Father of Medicine, introduced the Hippocratic Oath, which has remained a foundational document for medical ethics worldwide. It emphasizes the duty of physicians towards patients and society.
Reason (R) is also true. The Hippocratic Oath establishes a high moral and ethical standard for doctors. It highlights values such as honesty, confidentiality, non-maleficence ("do no harm"), and compassion. It requires doctors to uphold absolute integrity and dedication to their profession.
Since the reason directly explains why the Hippocratic Oath is central to medical ethics, both A and R are true, and R is the correct explanation of A.
Therefore, the correct answer is Option (a).