What is the name of the protein that helps to stabilize the tetrameric structure of hemoglobin?

A Hemopexin
B Haptoglobin ✓
C Methemoglobin reductase
D AhR (aryl hydrocarbon receptor) stabilizing protein

Explanation

Haptoglobin helps to stabilize the tetrameric structure of hemoglobin by binding to the alpha-globin chains, preventing dissociation into dimers.

Source

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