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
[{'content': 'Cart Wheel sign is seen in - \nSelect and explain. \nA. ASOM, B. AOM, C. OME, D. CSOM', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Otoscopy Signs for ASOM:\n\nThere is congestion of pars tensa\nLeash of blood vessels appear along the handle of malleus and at the periphery giving it a cartwheel like appearance.\nTransluscency is reduced.\nLater tympanic membrane appears red and bulging with loss of landmarks.\nTympanic membrane is immobile n pneumatic ostoscopy', 'role': 'assistant'}]