HbH is associated with:: (A) Deletion of 3 alpha genes, (B) Deletion of 4 alpha genes, (C) Deletion of 3 beta genes, (D) Deletion of 4 beta genes
Answer is A. HbH Disease is associated with deletion of 3 out of 4 alpha globin genes. Ref: Robbins pathologic basis of disease 6th edn/page 619.