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': "Thrombomodulin thrombin complex prevents clotting because - \nSelect and explain. \nA. Thrombomodulin inhibits prothrombin activator, B. The complex activates antithrombin III, C. Thrombomodulin-thrombin complex activates heparin, D. The complex removes thrombin and also activates protein kinase 'C' which inactivates factors V & VIII", 'role': 'user'}, {'content': 'Answer: D \nExplanation: None', 'role': 'assistant'}]