A) plants
B) micro-organisms in caecum
C) animals
D) all of the above
Correct Answer: B
Solution :
Vitamin\[\text{-}{{\text{B}}_{\text{12}}}\] is not found in plants. However it is considered that Spirulina (an algae) contain vitamin\[\text{-}{{\text{B}}_{\text{12}}}\]. Vitamin\[\text{-}{{\text{B}}_{\text{12}}}\]is synthesized by intestinal bacteria which intact are main source of vitamin\[\text{-}{{\text{B}}_{\text{12}}}\]. Many micro organisms (bacteria of the stomach of ruminant mammals also synthesize large quantities of vitamin-\[\text{-}{{\text{B}}_{\text{12}}}\]. Liver and kidney in animals are richest source otvitamin\[\text{-}{{\text{B}}_{\text{12}}}\].
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