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: Ophthalmology
[{'content': 'Simultaneous thrombosis of both the cavernous sinuses usually occurs in: \nSelect and explain. \nA. Diseases of the sphenoid sinuses, B. Septic wounds of the face, C. Pyogenic meningitis, D. Patients with cerebral abscess', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Ans. Diseases of the sphenoid sinuses', 'role': 'assistant'}]