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
[{'content': 'Flaer assay is used for \nSelect and explain. \nA. Hereditary spherocytosis, B. Thalassemia, C. Paroxysmal nocturnal hemoglobinuria, D. All of the above', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Flaer (Flourescein\xa0- Labelled proaerolysin) is sensitive test for PNH.', 'role': 'assistant'}]