Step 1: Understanding the Concept:
High Courts have powers to control and monitor the subordinate courts and tribunals.
Step 2: Detailed Explanation:
- Reason R is correct: Article 227 gives High Courts the power of superintendence.
- Assertion A is correct: This power of superintendence is dual in nature. Judicially, the High Court can correct jurisdictional errors of lower courts. Administratively, it can call for returns, make rules, and prescribe forms.
Since the power mentioned in R is what allows the High Court to exercise these dual roles, R is the correct explanation of A.
Step 3: Final Answer:
Both are correct and R explains A.