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: ENT
A 3-year-old girl ruptured her eardrum when she inseed a pencil into her ear. Her mother took her to the emergency depament after noticing that the child was crying and complaining of pain in her ear with a few drops of blood in the external auditory meatus. The attending doctor examined the child for possible injury to a nerve that runs across the the eardrum. Which is the MOST likely nerve to be injured? 
Select and explain. 
A. Auricular branch of the vagus, B. Chorda Tympani, C. Glossopharyngeal(CN IX), D. Lesser petrosal
B: Chorda Tympani
Answer: B: Chorda Tympani 
Explanation: Chorda Tympani lies across the tympanic membrane, so it's possible that this nerve was injured by the pencil.