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
What is the colour of the normal tympanic membrane: 
Select and explain. 
A. Pearly grey, B. Pink, C. Blue, D. Red
A: Pearly grey
Answer: A: Pearly grey 
Explanation: (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