Human chorionic gonadotropin:
a. is secreted by the ovary
b. is secreted by the anterior pituitary gland in response to implantation of the developing embryo
c. maintains the corpus luteum
d. in the urine is the basis for the pregnancy diagnostic test
e. absence will cause collapse of the corpus luteum and spontaneous abortion

d. in the urine is the basis for the pregnancy diagnostic test

Explanation:

The human chorionic gonadotropin is a hormone which is secreted by the cells of the placenta formed as a covering for fertilized egg which get attached to the uterine wall. This hormone is the basis for pregnancy test. This hormone can be detected in the urine of the pregnant woman hence, can be detected to ensure the pregnancy.