In India, marriageable age for boys is ______ and girls is ______ respectively.
$21, 18 \;years$
$15, 14 \;years$
$15, 18 \;years$
$18, 21 \;years$
First dose of $BCG$ vaccine is given at the time of
Average population density on earth is
What percentage of the world population lives in India
'Nirodh' is a popular brand of
$NCCP$ stands for