Night Jasmine, the shrub that emits fragrance during night, is
Cestrum nocturnum
Cestrum nocturnum, commonly known as night-blooming jasmine, night-blooming cestrum and raatrani is a species of flowering plant belonging to family Solanaceae. It is an evergreen woody shrub native to West Indies. It is grown in subtropical regions as an ornamental plant for its flowers that emits high fragrance during the night. So, the correct answer is 'Cestrum nocturnum'.