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': 'Tissue thromboplastin activates: \nSelect and explain. \nA. Factor-VII, B. Factor-IV, C. Factor-VI, D. None of the above', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Factor VII', 'role': 'assistant'}]