Intravascular hemolytic anemia intro maha ddx

What is the most common cause of intravascular hemolysis when RBCs are destroyed in the blood vessels?

1: Autoimmune hemolytic anemia
2: Microangiopathic hemolytic anemia (MAHA)
3: Hereditary spherocytosis
4: Paroxysmal nocturnal hemoglobinuria (PNH)