Read the following statements about menstrual cycle and select two correct statements:
(i). Lack of menstruation may be indicative of pregnance
(ii). The changews in the ovary and the uterus are induced by changes in the lveles of ovarian hormones only
(iii). LH suge induces ovulation
(iv). If fertilisation occurs, corpus luteum degenerates immediately

Options

A. (i) and (ii)
B. (ii) and (iii)
C. (i) and (iii)
D. (ii) and (iv)

Answer

C

Explanation

Lack of menstruation may be indicative of pregnancey. During preganance, the levels of estrogen and progesterone are high in the blood. Which are required for the maintenance of uterus and thus, mensturation does not occur. On `14^(th)` day of the menstrual cycle. there is rapid increase in LH (called LH surge), that induces ovulation. The changes in the ovary and the uterus are induced by change in the level of ovarian hormones and pituitary hormones, if fertilisation occurs, corpus luteum degenerates by `16^(th)` week of pregancy.