This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Ear, Subject name: ENT
[{'content': 'Dehiscence in the external auditory canal cause infection in the parotid gland via: \nSelect and explain. \nA. Fissure of Santorini, B. Notch of Rivinus, C. Petro-tympanic fissure, D. Retro pharyngeal fissure', 'role': 'user'}, {'content': 'Answer: A \nExplanation: (a) Fissure of Santorini(Ref. Cummings, 6th ed., 1981)The notch of Rivinus is the upper attachment of pars flaccida.Petro-tympanic fissure is present on the anterior wall of middle ear, on which attaches the anterior malleolar ligament.Retropharyngeal fissure does not exist.', 'role': 'assistant'}]