Home ยป Which of the following nutrient deficiency causes megaloblastic anaemia? Vitamins MCQs Which of the following nutrient deficiency causes megaloblastic anaemia? January 26, 2022 2 Views Q. Which of the following nutrient deficiency causes megaloblastic anaemia? A. Folic acid B. Niacin C. Pyridoxine D. Cobalamin Answer: Folic acid.