This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Head and neck, Subject name: Anatomy
[{'content': 'Greater petrosal nerve is formed from \nSelect and explain. \nA. Geniculate ganglion, B. Plexus around ICA, C. Plexus around middle meningeal aery, D. None of the above', 'role': 'user'}, {'content': 'Answer: A \nExplanation: The greater petrosal nerve arises from the geniculate ganglion. It consists of preganglionic parasympathetic fibres that relay in the pterygopalatine ganglion and supply the secretomotor fibres to the lacrimal gland and the mucous glands of nasal cavity and palate.Reference: Textbook of anatomy, Head neck, and brain, Vishram Singh, 2nd edition, page no342', 'role': 'assistant'}]