This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Trauma, Subject name: Surgery
'Tennis elbow' is characterized by 
Select and explain. 
A. Tenderness over the medial epicondyle, B. Tenderness of common extensor origin, C. Tendinitis of common flexor origin, D. Painful flexion and extension
B: Tenderness of common extensor origin
Answer: B: Tenderness of common extensor origin 
Explanation: Tennis Elbow (Lateral Epicondylitis) This is the most common cause of elbow pain excluding traumatic conditions Usually occur in patients of 30-40 years, etiology is unknown in most cases Strenous or over activity may precede spymptoms Anterodistal lateral epicondyle tenderness Diagnosis Resisted wrist extension is a reliable diagnostic test Local anaesthetic injection is diagnostically helpful Treatment Vast majority improve with supervised Conservative management Open or ahroscopic release yields good results in recalcitrant cases Ahroscopic release also identifies associated pathology Ref: Bailey and love 27th edition Pgno : 448