The richest sources of vitamin-B12 are 

(a) goat's liver and Spirulina

(b) chocolate and green gram

(c) rice and hen's egg

(d) carrot and chicken's breast

Audio Explanation:

(a) Vitamin-B12 (cyanocobalamin) is the only vitamin which is not found in vegetables. It is present in animal protein such as meat, liver, fish and Spirulina (single cell protein). It promotes DNA synthesis, maturation of RBCs and myelin formation.

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