What is the function of the enzyme L-lactate dehydrogenase in red blood cells regarding hemoglobin and oxygen transport?

A To convert lactate to pyruvate
B To generate NADH for methemoglobin reduction ✓
C To reduce oxidized glutathione
D To phosphorylate hemoglobin

Explanation

L-lactate dehydrogenase helps in generating NADH, which is used by the enzyme methemoglobin reductase to reduce methemoglobin back to normal hemoglobin, thus maintaining the ability of hemoglobin to bind oxygen.

Source

Medical Biochemistry texts
Hematology Hematology: Hemoglobin and Oxygen Transport Hematology: Hemoglobin and Oxygen Transport Medium MEDICAL Confidence: high