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': 'What is the colour of the normal tympanic membrane: \nSelect and explain. \nA. Pearly grey, B. Pink, C. Blue, D. Red', 'role': 'user'}, {'content': 'Answer: A \nExplanation: (a) Pearly grey(Ref. Scott Brown, 8th ed., Vol 2, page 923)Condition of the earColour of TMNormalPearly greyGlue ear or SOMBlueASOMRed (congested)Active otosclerosisFlamingo pink', 'role': 'assistant'}]