Assertion : Exretion in cockroach occurs by Malpighian tubules
Reason : Each Malpighian tubule is lined by on-ciliated columnar cells.
A. If both assertion and reason are true and reason is the correct explanation of assertion
B. If both assertion and reason are true but reason is not the correct explanation of assertion
C. If assertion is true but reason is false
D. If both assertion and reason are false