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: Pathology
[{'content': 'PNH is associated with a deficiency of: \nSelect and explain. \nA. DAF, B. MIRL, C. GPI Anchored protein, D. All of the above', 'role': 'user'}, {'content': "Answer: D \nExplanation: PNH is associated with deficiency of GPI anchor proteins and thereby leading to absence of about 20 external surface membrane proteins to which it attaches. CD55 (DAF) and CD59 (MIRL) are two such complement defence proteins. Ref: Harrison's Principles of Internal Medicine, 16th Edition, Page 616; Wintrobe's Clinical Hematology By John P. Greer, Maxwell Myer Wintrobe, Page 998.", 'role': 'assistant'}]