This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Hematopoeisis: Basic concepts, Subject name: Pathology
[{'content': 'Linzenmeyer is used to measure: \nSelect and explain. \nA. Bleeding time, B. Clotting time, C. Prothrombin time, D. ESR', 'role': 'user'}, {'content': 'Answer: D \nExplanation: - Linzenmeyer is old technique used to measure eythrocyte sedimentation rate.', 'role': 'assistant'}]