From which part of the 'Cinchona' 'quenine' obtains?

Question

From which part of the 'Cinchona' 'quenine' obtains? (A) Bark of stem (B) Leaf (C) Root (D) flower

Tardigrade Admin · Accepted Answer

Quinine obtains from bark of plant Cinchona (Cinchona officinalis), belongs to family Rubiaccae used for treating malaria.

Q. From which part of the 'Cinchona' 'quenine' obtains?