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
When evaluating for possible otitis media, which of the following is of the least diagnostic value? 
Select and explain. 
A. History of a new onset of ear pulling staing several days after URI, B. Presence of the light reflex, C. Translucency of the tympanic membrane (TM), D. Mobility in response to pneumatoscopy
B: Presence of the light reflex
Answer: B: Presence of the light reflex 
Explanation: The light reflex can often be visualized in an abnormal ear. Gauging, decreased translucency of the TM and evaluating for the presence of a fluid level behind the TM requires experience, but these are good indicators of infection when detected. Mobility in response to pneumatoscopy is also quite sensitive in practiced hands. New-onset ear pulling after URI is frequently associated with otitis media. Ref: Diseases of ENT by Dhingra 6th edition Pgno : 65