Menstrual Cycle

Apes, which include species such as chimpanzees, bonobos, gorillas, and orangutans, undergo menstrual cycles. During the menstrual cycle, these species experience hormonal changes that result in the shedding of the uterine lining (menstruation) if fertilization and pregnancy do not occur.

Tigers, cows, and rats do not exhibit a menstrual cycle. Tigers and cows have reproductive cycles that involve estrus or heat, where they show specific behaviors indicating their readiness to mate. Rats, on the other hand, have a different reproductive cycle called an estrous cycle.

Therefore, the correct answer is (D) apes.

Menstruation phase | Follicular phase | Luteal phase

(A) Regeneration of endometrium | High level of progesterone | Developing corpus luteum

(B) Matured follicle | Regression of corpus luteum | Ovulation

(C) Menses | Developing corpus luteum | Follicle maturation

(D) Menses | L.H. Surge | Regeneration of endometrium

The correct answer is (D) : (4).