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
Dysfunction of tympanic membrane is characterized by all except - 
Select and explain. 
A. Normal 'cone of light', B. Retracted TM, C. Nonprominent umbo, D. Fullness in middle ear
A: Normal 'cone of light'
Answer: A: Normal 'cone of light' 
Explanation: Retracted Tympanic Bembrane
It is the result of negative intratympanic pressure when Eustachian tube is blocked
Characteristics

It appears dull and lusterlessQ
Cone of light is absent or interruptedQ
Handel of malleus appears foreshortened Q
Lateral process of malleus becomes more prominent Q
Anterior and posterior malleal folds become sickle shaped Q
It is immobile or has limited mobility when tested with pneumatic otoscope or siegle’s speculum.

Features of Normal Tympanic Membrane

It is shiny and pearly grey in colour
Has concavity on its lateral surface
Cone of light seen in antero – inferior quadrant
It’s transparency varies
It is mobile when tested with pneumatic otoscope or siegle’s speculum.