Antibiotics are

Medicines are either man-made (i.e.,synthetic) or obtained from living organisms like plants,bacteria,animals,etc.,and hence,the latter are called natural products. Sometimes,natural products are chemically altered by man to reduce toxicity or side effects. Write against each of the following whether they were initially obtained as a natural product or as a synthetic chemical: $(a)$ Penicillin $(b)$ Sulphonamide $(c)$ Vitamin-$C$ $(d)$ Growth hormone.

Which of the following are included in microorganisms?

What does $Rauwolfia$ $vomitoria$ produce?

The richest sources of vitamin $B_{12}$ are

The drug quinine is obtained from which of the following?