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B
Corona radiata
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C
Corpus luteum
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D
Placenta
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Solution
The correct option is B Placenta
HCG is Human chorionic gonadotropin. Implantation of the fetus in the uterus takes place 9 days after fertilization.
This is followed by the formation of the placenta that connects the growing fetus with the mother.
HCG is the first hormone secreted by the placenta that promotes the production of progesterone by the corpus luteum and angiogenesis of the uterine wall. Thus the correct answer is option D.