Assertion: The squamous epithelium is made of a single thin layer of flattened cells with irrengular boundaries.
Reason: They are found in walls of blood vessels and air sacs of wings.
A. If both assertion and reason are true and the reason is the correct explanation of the assertion
B. If both assertion and reason are true but reason is not the correct explanation of the assertion
C. If the assertion is true but reason is false
D. If both assertion and reason are false
