Assertion: After implantation, finger-like projections appear on the trophoblast called chorionic villi.
Reason: Chorionic villi are surrounded by the uterine tissue and maternal blood.

Options

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

Answer

B

Explanation

After implanation, finger-like projections appear on the trophoblast called chorionic villi which are surrounded by the uterine tissue and maternal blood. The chronic villi, and uterine tissue become intergitated with each other and jointify form a structural and functional unit between developing embryo (fetus) and maternal body called placenta