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': 'Sago grain appearance is seen in \nSelect and explain. \nA. Healed myringitis bullosa, B. Otomycosis, C. Malignant otitis externa, D. Keratosis obturans', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Myringitis bullosa It is a painful condition characterized by the formation of haemorrhagic blebs on the tympanic membrane and deep meatus. It is probably caused by a virus or Mycoplasma pneumonia. Ref: Dhingra, ENT, 6th edition, pg no.55', 'role': 'assistant'}]