After implantation,finger-like projections on the trophoblast are called $...A....$ which are surrounded by $...B..$ and maternal blood. Here $A$ and $B$ refers to
- A$A-chorion; B-foetal\; cell$
- B$A-chorionic\; villi; B-uterine\; tissue$
- C$A-uterine\; tissue; B-chorionic\; villi$
- D$A-foetal\; cell; B-chorion$
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