Human population after $17$th century $A.D.$ is thought to be in

Syphilis is an infectious bacterial disease caused by Treponema pallidum with $3$ stages

$(A)$ Infectious painless ulcers on the genitals $\quad$$(i)$ First

$(B)$ Blindness, heart trouble,aortic impairment $\quad$$(ii)$ Second

$(C)$ Skin lesions, hairloss,swollen joints $\quad$$(iii)$ Third
Which of the following is the correct match between the symptoms and stage?

According to the population of world, India is placed at

$AIDS$ day is

Which of the following graphs is the correct representation of the level of progesterone in a female who has been using Mala$-D$ as a method of birth control.