This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Anatomy
[{'content': 'Tympanic plexus is formed by- \nSelect and explain. \nA. Tympanic branch of glosopharyngeal nerve, B. Vagus nerve, C. Gacial nerve, D. Mandibular nerve', 'role': 'user'}, {'content': 'Answer: A \nExplanation: A i.e. Tympanic', 'role': 'assistant'}]