This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Cranial cavity, Subject name: Anatomy
[{'content': 'Falx cerebri contains: \nSelect and explain. \nA. Occipital sinus, B. Straight sinus, C. Superior petrosal sinus, D. Transverse sinus', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Falx cerebri is a double fold of duramater containing superior and inferior sagittal sinus. It also contains straight sinus at the base. Occipital sinus runs in the falx cerebelli, whereas superior petrosal sinus and transverse sinus run in the attached margin of tentorium cerebelli.', 'role': 'assistant'}]