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 19 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)