This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Medicine
A stem cell disorder affecting all the three cell lines; platelets, RBCs and leucocytes is - 
Select and explain. 
A. Hemolytic anaemia, B. Paroxysmal cold haemoglobinuria, C. Paroxysmal nocturnal haemoglobinuria, D. Blackfan Diamond syndrome
B: Paroxysmal cold haemoglobinuria
Answer: B: Paroxysmal cold haemoglobinuria 
Explanation: None