This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: NEET 2019, Subject name: Medicine
Which of the following is a cause of intravascular hemolysis? 
Select and explain. 
A. Warm type autoimmune hemolytic anemia, B. PNH, C. Cold agglutinin disease, D. Hereditary spherocytosis
B: PNH
Answer: B: PNH 
Explanation: Intravascular destruction of red blood cells: Microangiopathy (eg aoic stenosis, prosthetic valve leak) Transfusion reactions (eg ABO incompatibility) Infection (eg clostridial sepsis, severe malaria) Paroxysmal cold hemoglobinuria March hemoglobinuria Paroxysmal nocturnal hemoglobinuria Following intravenous infusion with hypotonic solutions Snake bites Exposure to compounds with high oxidant potential (eg copper in Wilson's disease)