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': 'Connecting sinus between cavernous sinus and transverse sinus \nSelect and explain. \nA. Superior petrosal sinus., B. Inferior petrosal sinus., C. Horizontal sinus, D. Horizontal sinus   Vertical sinus.', 'role': 'user'}, {'content': 'Answer: A \nExplanation: None', 'role': 'assistant'}]