This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Cranial Nerves, Subject name: Anatomy
[{'content': 'True about tympanic nerve: \nSelect and explain. \nA. Is a branch of the facial nerve, B. Contains postganglionic parasympathetic fibers, C. Synapses with fibers in the lesser petrosal nerve, D. Is a branch of the glossopharyngeal nerve', 'role': 'user'}, {'content': 'Answer: D \nExplanation: The Tympanic nerve, or Jacobson nerve, is a branch of the Glossopharyngeal nerve. It contains preganglionic parasympathetic fibers, and forms a tympanic plexus on the medial wall of the middle ear with sympathetic fibers. The Tympanic nerve continues beyond the plexus as the Lesser petrosal nerve, which transmits preganglionic parasympathetic fibers to the otic ganglion for synapse.', 'role': 'assistant'}]