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': 'True regarding blood coagulation is \nSelect and explain. \nA. Addition of Vitamin-K to the freshly drawn blood sample delays clotting, B. Thrombin conves fibrin to fibrinogen, C. Heparin inhibits blood coagulation by interfering with Vitamin K metabolism in the liver, D. Platelet is essential for blood clot formation', 'role': 'user'}, {'content': 'Answer: D \nExplanation: . Platelet is essential for blood clot formation', 'role': 'assistant'}]