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Match the following columns and select the correct option:
Column I Column II
A Blastocyst I Maternal tissue + Foetal tissue
B Birth canal II Cortex + Medulla
C Ovarian stroma III Cervical canal + Vagina
D Placenta IV Trophoblast + inner cell mass

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A-IV, B-I, C-II, D-III

A-IV, B-III, C-II, D-I

A-I, B-II, C-III, D-IV

A-IV, B-I, C-III, D-II

answer is B.

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Detailed Solution

A-IV	Blastocyst has an outer layer of cells (trophoblast) and inner group of cells (ICM).
B-III	Cervical canal and vagina together form the birth canal.
C-II	Ovarian stroma consists of a peripheral cortex and an inner medulla.
D-I	Placenta is formed due to interdigitation of the blastocyst (foetal) with the uterine tissue (maternal).

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