Which of the following types of hemoglobin is characterized by a tetramer composed of two alpha-globin and two gamma-globin chains?

A Hemoglobin A (HbA)
B Hemoglobin F (HbF) ✓
C Hemoglobin A2 (HbA2)
D Hemoglobin C (HbC)

Explanation

Hemoglobin F (HbF) is the main oxygen transport protein in the fetus, composed of two alpha-globin and two gamma-globin chains.

Source

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