What is the name of the enzyme responsible for converting methemoglobin to normal hemoglobin?

A Methemoglobin reductase
B Cytochrome b5 reductase
C Diaphorase
D NADH-methemoglobin reductase ✓

Explanation

NADH-methemoglobin reductase is the enzyme responsible for converting methemoglobin to normal hemoglobin, which is essential for maintaining the normal function of hemoglobin in oxygen transport.

Source

Guyton and Hall Textbook of Medical Physiology
Hematology Hematology: Hemoglobin and Oxygen Transport Hematology: Hemoglobin and Oxygen Transport Medium MEDICAL Confidence: high