The correct option is A Roots
Atropa belladonna is commonly known as belladonna or deadly nightshade. It is a perennial herbaceous plant in the family Solanaceae. It is found in North America, Europe and Western Asia. It is a most important medicinal plant. The drug atropine is also derived from the plant. The chemical constituents obtained from the leaves and root form the basic ingredients used in a variety of antispasmodics are very commonly prescribed to treat intestinal diseases i.e., peptic ulcers, persistent diarrhea and an irritable colon among other disorders.