Colchicine is a natural compound that is extracted from the autumn crocus plant, which belongs to the genus Colchicum. The plant is commonly known as colchicum, meadow saffron, or autumn crocus. It is important to note that this plant should not be confused with the true crocus, which is a different genus.
Colchicine is extracted from the seeds, bulbs, or corms of the colchicum plant. It has various medical uses, including the treatment of gout and certain inflammatory conditions. Colchicine is also used in plant breeding and genetics research as it can disrupt cell division and act as a mitotic inhibitor.
Therefore, the correct plant used to extract colchicine is Colchicum (option B).