Which enzyme is responsible for converting methemoglobin to normal hemoglobin in red blood cells?

A Cytochrome b5 reductase ✓
B Diaphorase
C Methemoglobin reductase
D NADH dehydrogenase

Explanation

Cytochrome b5 reductase is an enzyme that reduces methemoglobin to normal hemoglobin in red blood cells, helping to maintain normal oxygen transport.

Source

Biochemistry textbook by Stryer
Hematology Hematology: Hemoglobin and Oxygen Transport Hematology: Hemoglobin and Oxygen Transport Hard MEDICAL Confidence: high