Step 1: Understanding the Question:
• This is an Assertion-Reason question on the philosophy of Realism.
Step 2: Detailed Explanation:
• Assertion (A): Realism is regarded as an orthodox (traditional) philosophy that traces back to Plato's theory of forms. As per the key, (A) is correct.
• Reason (R): Realism denotes two sets of theories, one about the nature of universals (concepts) and the other about knowledge of the world. This is correct.
• The two-fold character in (R) accounts for why Realism is described as it is in (A), so (R) is taken as the explanation of (A), in agreement with the NTA final answer key.
Step 3: Final Answer:
The correct option is (A) Both (A) and (R) are correct and (R) is the correct explanation of (A).