The correct option is C Datura stramonium
Scopolamine is an anticholinergic medicine. Scopolamine has many effects in the body including decreasing the secretion of fluids, slowing the stomach and intestines and dilation of the pupils. Scopolamine is used to relieve nausea, vomiting and dizziness associated with motion sickness and recovery from anesthesia and surgery. Scopolamine may also be used in the treatment of parkinsonism, spastic muscle states, irritable bowel syndrome, diverticulitis, and other conditions. It is among the secondary metabolites of plants from Solanaceae (nightshade) family of plants, such as henbane, jimson weed (Datura), angel's trumpets (Brugmansia) and corkwood (Duboisia). Thus, the correct answer is option C.