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: Unknown
[{'content': '“Flipping effect” is ? \nSelect and explain. \nA. LDH 1> LDH 2, B. LDH2>LDH1, C. LDH 2> LDH 3, D. LDH 3>LDH 2', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Ref. API Textbook of Medicine. Pg. 798\n\xa0\nLactate dehydrogenase, tetrameric enzyme with 4 subunits,\n\n4 Subunits with 2 isoforms - H isoform (Heart) & M isoform (Muscle)\nHeart & RBCs - LDH-1 (4H);\nReticuloendothelial system - LDH-2 (3H1M)\nLungs - LDH-3 (2H2M)\nKidneys, placenta, & pancreas - LDH-4 (1H3M)\nLiver & striated muscle - LDH-5 (4M)\n\nFlipping effect\n\nUsually LDH 2 in predominant in serum & LDH 1 is predominant in heart\nHigher levels of LDH 1 than LDH 2 (Flipped pattern) is suggestive of myocardial infarction', 'role': 'assistant'}]