Which of the following is a perennial herbaceous plant in the nightshade family Solanaceae that is used in alternative medicine as an aid in treating arthritis pain, colds or hay fever?

Explanation

Atropa belladonna is a perennial herb in Solanaceae that has been used in alternative remedies. Such use does not establish effectiveness for the listed conditions. The plant contains toxic tropane alkaloids; this identification is not a treatment recommendation.