Which of the following is the only hemolytic anaemia caused by acquired intrinsic defect in the cell membrane:
PNH is the only hemolytic anemia caused by an acquired intrinsic defect in the cell membrane. 
The stem cells of the bone marrow acquire mutations in Phosphatidyl inositol glycan A (PIGA) gene. 
The triad of hemolysis, pancytopenia and thrombosis is unique to PNH. 
Thrombosis is the leading cause of disease related death in PNH.