The following graph of relative concentrations of the four hormones present in the blood plasma of a woman during her menstrual cycle. Identify the hormones $A, B, C$ and $D$

Which hormone level reaches peak during luteal phase of menstrual cycle?

During embryonic development the establishment of polarity along anterior / posterior, dorsa l/ ventral or medial / lateral axis is called

Assertion : Senescence is the time when age associated defects are manifested.

Reason : Certain genes may be undergoing sequential switching on and off during one's life.

During embryonic development, the establishment of polarity along anterior/ posterior, dorsal/ventral or medial/lateral axis is called