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: Pediatrics
[{'content': 'The gold standard lab test for diagnosis of paroxysmal nocturnal Hemoglobinuria is \nSelect and explain. \nA. Ham test, B. Nestroft test, C. Sucrose lysis test, D. Flow cytometry', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Flow cytometry\n\nIt is gold standard test for diagnosis of PNW\nIt shows absence of CD55\xa0and CD59 on RBC', 'role': 'assistant'}]