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': 'Anti coagulant used in coagulation study is - \nSelect and explain. \nA. Calcium citrate, B. EDTA, C. Sodium bromide, D. Trisodium citrate', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Answer- D. Trisodium citrateFor coagulation studies: Trisodium citrate (citric acid).', 'role': 'assistant'}]