Home » Which of the following extrinsic factor is required for maturation of RBCs? Cell Organelles Which of the following extrinsic factor is required for maturation of RBCs? January 19, 2022 7 Views Q. Which of the following extrinsic factor is required for maturation of RBCs? A. Vit B12 B. Folic acid C. Iron D. Both (a) and (b) Answer: Both (a) and (b)