Which of the Following Is Characteristic of Hemoglobin D Disease

Multiple Choice

Which of the following is characteristic of hemoglobin D disease?

A) Most common variant in American blacks is HbD Punjab (HbD Los Angeles)
B) Less than 0.02% frequency in American blacks
C) Both homozygous and heterozygous states are asymptomatic
D) Peripheral blood smear is unremarkable, except for a few target cells
E) All of the above