<prompt> B-Carotene, precursor of vitamin A, is oxidatively cleaved by:b-Carotene dioxygenaseOxygenaseHydroxylaseTransferase  <response>: Ans. A. b-Carotene dioxygenaseCarotene is cleaved by b-carotene dioxygenase of intestinal cells to release 2 moles of retinal which is reduced to retinol. 