D) option is ;the corpus luteum of pregnancy maintains the uterus until the placenta is well established. 
Explain the answer

Q7. All of the following statements concerning pregnancy are accurate EXCEPT

     (a) the detection of human chlorotic gonadotropin in the urine forms the basis for pregnancy tests.

     (b) the cyclic release of pituitary gonadotropins and ovarian steroids is continued.

     (c) the mammary gland tissue of the pregnant woman is stimulated to develop by placental hormones.

Dear student
Please find below the solution to the asked query
 

The correct option is b.

After pregnancy, the cyclic release of pituitary gonadotropins and ovarian steroids is reduced. The ovarian follicles after releasing egg turns into corpus luteum. The hCG stimulates the corpus luteum to keep secreting progesterone which help in maintaining pregnancy. Later on placenta also secretes estrogen and progesterone to help maintain pregnancy and development of baby. 


 
Hope this information will clear your doubts about the topic.
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Option D
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All of them are correct option d is not mentioned
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