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Answer: (2) Vitamin B12

Vitamin B12 (cyanocobalamin) is needed for the formation of red blood cells. Its deficiency causes pernicious anaemia, in which the number of RBCs falls and the haemoglobin level drops.

Other deficiencies: vitamin B1 (thiamine) causes beriberi, vitamin B2 (riboflavin) causes cheilosis and cracking of lips, and vitamin B6 (pyridoxine) causes convulsions.

Doubtly AI · 23 Oct 2026 AI-verified · Oct 2026 Report
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