Vitamin B12 (Cobalamin) is unique among all vitamins because it is synthesized exclusively by anaerobic bacteria and archaea.
Higher plants do not synthesize and do not require Vitamin $B_{12}$, meaning it is completely absent from unfortified food of plant origin (grains, legumes, fruits, vegetables).
Animals obtain Vitamin $B_{12}$ by consuming animal products (liver, meat, milk, eggs) or through symbiotic gastrointestinal/ruminal microbial synthesis.
nalysis:
(Vitamin B12): Correct vitamin absent in plant sources.
Correct option: (3) Vitamin B12
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