Scientificstudy of human population is called

Which of the following stages of syphilis is characterised by a skin rash, fever and aches in the joints and muscles?

$MTPs$ are considered relatively safe up to ________ weeks of pregnancy

Cause of decline of population in $1927$ was

'Nirodh' is a popular brand of

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?