This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Nose and paranasal sinuses, Subject name: ENT
[{'content': 'The most common site for CSF rhinorrhoea is - \nSelect and explain. \nA. Ethmoidal sinuses, B. Maxillary sinuses, C. Frontal sinus, D. Tegmen tympani', 'role': 'user'}, {'content': 'Answer: A \nExplanation: The most common site of traumatic CSF rhinorrhoea is the fracture of that pa of the cribriform plate which forms the roof of the ethmoid sinus. (Ref: Cummings, 6th edition, pg no. 804)', 'role': 'assistant'}]