This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Diseases of Nose and Paranasal Sinuses, Subject name: ENT
[{'content': 'In CSF rhinorrhea CSF from middle cranial fossa reaches the nose : \nSelect and explain. \nA. Sphenoid sinus, B. Frontal sinus, C. Cribriform plate, D. Fovea ethmoidalis', 'role': 'user'}, {'content': 'Answer: A \nExplanation: CSF from anterior cranial fossa reaches the nose cribriform plate, roof of ethmoid air cells or frontal sinus. CSF from middle cranial fossa reaches the nose sphenoid sinus. Fractures of temporal bone result in leakage of CSF into the middle ear and escapes through eustachian tube into the nose (otorhinorrhoea).', 'role': 'assistant'}]