Question

Which of the following instruction brings the control back to the main program from subroutine?

• A. RET
• B. HLT
• C. JMP
• D. CALL

Hint:

Subroutine instructions: \[ \boxed{ \text{CALL} \rightarrow \text{Jump to subroutine} } \] \[ \boxed{ \text{RET} \rightarrow \text{Return to main program} } \]

Answer 1

The Correct Option is A

Step 1: Recall the function of RET instruction. The RET (Return) instruction retrieves the return address from the stack.

Step 2: Determine its purpose. After executing a subroutine, RET transfers program control back to the instruction immediately following the CALL instruction. Hence, \[ \boxed{\text{RET}} \] is the correct answer. Therefore, \[ \boxed{(A)} \] is the correct answer.