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: Anatomy
[{'content': 'Internal jugular vein is a continuation of: \nSelect and explain. \nA. Common Facial Vein, B. External Jugular Vein, C. Sigmoid Sinus, D. Superior Petrosal Sinus', 'role': 'user'}, {'content': 'Answer: C \nExplanation: None', 'role': 'assistant'}]