Assertion :- Sieve tube element and companion cell are called sister cells.
Reason :- Sieve tube element and companion cells arise from same mother cells.
A. If both Assertion & Reason are True & Reason is a correct explanation of the Assertion.
B. If both Assertion & Reason are True but the Reason is a correct explanation of the Assertion.
C. If Assertion is True but the Reason is False.
D. If both Assertion & Reason are false.