Why Is Hydrops Fetalis Largely Restricted to Southeast Asia?
A) $\alpha$

Why is hydrops fetalis largely restricted to Southeast Asia?

A) Dietary differences between populations affect expressivity of the phenotype
B) The type of malaria present in this area
C) Two α-globin alleles are commonly deleted in cis in this population
D) ( $\alpha$ -) Thalassemia carrier status is most common in this population
E) A compensating hemoglobinopathy is less common in this population