What is the name of the book written by Aristotle?

The decreasing sequence of the three most populated cities of $M.P.$ according to the $1991$ census is:

The branch of biology dealing with the process of improving the human race through selective breeding is known as:

The study of snakes is called:

Which one of the following is not a petroleum product?

Match the branches of Biology listed in column $I$ with the areas of study listed in column $II$. Choose the answer which gives the correct combination of alphabets of the two columns.

Column $I$ (Branches of Biology)	Column $II$ (Area of Study)
$A$. Helminthology	$p$. Study of insects
$B$. Entomology	$q$. Study of fungi
$C$. Ornithology	$r$. Study of algae
$D$. Phycology	$s$. Study of birds
	$t$. Study of worms