Description : A vitamin requires cobalt for its activity. The vitamin is - (1) Vitamin B12 (2) Vitamin D (3) Vitamin B2 (4) Vitamin A
Last Answer : (1) Vitamin B12 Explanation: Vitamin B12, vitamin B1, or vitamin B12, also called cobalarnin, is a watersoluble vitamin with a key role in the normal functioning of the brain and nervous ... compounds (vitamers), all of which have vitamin activity. It contains the biochemically rare element cobalt.