This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Peripheral nerve injuries, Subject name: Orthopaedics
Phalen's test is used in which of the following condition ? 
Select and explain. 
A. De quervain tenosynovitis, B. Carpal tunnel syndrome, C. Trigger finger, D. Ulnar nerve injury
B: Carpal tunnel syndrome
Answer: B: Carpal tunnel syndrome 
Explanation: Phalen&;s test / wrist flexion : done in carpal tunnel syndrome - the patient is asked to actively place the wrist in complete but unforced flexion . If tingling sensation& numbness is produced in the median nerve distribution of the hand within 60 sec, the test is positive .It is most sensitive provocative test. Has a specificity of 80%. REF:textbook of ohopedics, John Ebenezer , 4th edition, pg.no 394