<prompt> Vitamin for which only animal source is available is:-Vitamin B1Vitamin B2Vitamin B12Vitamin C  <response>: - Vitamin B12Cyanocobalamine is only obtainable through animal sources, therefore strict vegetarians develop B12 deficiency. - Vit B12 deficiency leads to :- Megaloblastic anemia Peripheral neuritis SCDSC Infeility Atrophic glossitis Peripheral neuropathy. 