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': 'Infection spreading via lymphatics from the lower lip first enter the blood stream at the \nSelect and explain. \nA. Brachiocephalic vein, B. Inferior labial vein, C. Inferior labial artery, D. Pterygoid venous plexus', 'role': 'user'}, {'content': 'Answer: A \nExplanation: None', 'role': 'assistant'}]