Insecticide pyrethrum is obtained from
Chrysanthemum
Pyrethrum is a natural insecticide made from the dried flower heads of Chrysanthemum cinerariifolium and Chrysanthemum coccineum. Pyrethrum has been used for centuries as an insecticide. It is harmful and toxic to animals and human beings. Pyrethrum was cultivated as ornamentals for their showy flower heads. So, the correct answer is 'Chrysanthemum'.