Detailed Solution:
The correct answer is “saffron–seeds”.
1) The rhizome, which is the horizontal stem from which the roots grow, is the main portion of ginger that is consumed.
2) Saffron consists of the dried stigmas of the flowers of the crocus bulb, Crocus sativus.
3) Opium is simply the dried latex that is collected from the opium poppy.
4) Flax fiber is obtained from the inner bark of the stem of a plant grown in temperate and subtropical regions of the world.