This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Blood disorder, Subject name: Pathology
[{'content': 'Elevated ESR is seen in following conditions except: \nSelect and explain. \nA. Polymyositis rheumatica, B. Multiple myeloma, C. Temporal aeritis, D. Polycythemia rubra', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Polycythemia rubra: Elevated hemoglobin level and hematocrit: due to increased number of red blood cells * Platelet count or white blood cell count may also be increased. Erythrocyte sedimentation rate (ESR) is decreased due to an increase in zeta potential. Low erythropoietin (EPO) levels.', 'role': 'assistant'}]