This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Facial Nerve And Its Disorders, Subject name: ENT
[{'content': 'Dryness of eye is caused by injury to facial nerve at: \nSelect and explain. \nA. Chorda tympani, B. Vertical segment, C. Tympanic segment, D. Geniculate ganglion', 'role': 'user'}, {'content': 'Answer: D \nExplanation: (d) Geniculate ganglion(Ref. Cummings, 6th ed., 2606)Whenever there is injury before or at the origin of the greater superficial petrosal nerve (i.e. before or at the Geniculate ganglion) which is responsible for lacrimation there will be dry eye on the same side.Tympanic segment, Vertical segment and Chorda tympani all are beyond the geniculate ganglion.', 'role': 'assistant'}]