- A. Penicillin is an antibiotic derived from Penicillium fungi (III). While not a plant, it is a natural source and fits the context of derived drugs. - B. L- DOPA (Levodopa) is found naturally in plants like the Velvet bean (Mucuna pruriens) (I) and is used to treat Parkinson's disease. - C. Quinine is an antimalarial drug derived from the bark of the Cinchona tree, specifically species like Yellow Cinchona (Cinchona ledgeriana) (II). - D. Taxol (Paclitaxel) is a chemotherapy drug originally isolated from the bark of the Pacific yew tree (Taxus brevifolia) (IV).