This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Blood Physiology, Subject name: Physiology
[{'content': 'Arrange the following in the sequential order of appearance during intrinsic clotting pathway: A. Phospholipid B. Prekallikrien C. Activated factor V D. Factor XIII \nSelect and explain. \nA. B-A-C-D, B. A-C-D-B, C. D-B-A-C, D. B-D-C-A', 'role': 'user'}, {'content': 'Answer: A \nExplanation: TFI - tissue factor pathway inhibitor; TPL - tissue thromboplastin; PL - phospholipid', 'role': 'assistant'}]