This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Hemolytic Anemias: Basic concepts and classification, Subject name: Pathology
[{'content': 'All of the following are pre-leukemic conditions except \nSelect and explain. \nA. Paroxysmal nocturnal hemoglobinuria, B. Paroxysmal cold hemoglobinuria, C. Aplastic anemia, D. Myelodysplastic syndrome', 'role': 'user'}, {'content': 'Answer: B \nExplanation: - Paroxysmal cold hemoglobinuria aka cold hemolysin disease is associated with cold AIHA (Auto Immune Hemolytic Anemia). Its not pre-leukemic condition. Special antibody seen in this condition is Donath-Landsteiner Ab against P antigen. Most cases are seen in children following viral infections; in this setting the disorder is transient, and most of that affected recover within 1 month. - Remaining all conditions given in options are pre-leukemic conditions.', 'role': 'assistant'}]