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: Orthopaedics
A 40-year-old man was repairing his wooden shed on Sunday morning. By afternoon, he felt that the hammer was becoming heavier and heavier. He felt pain in the lateral side of the elbow and also found that squeezing water out of sponge hurt his elbow. Which of the muscles are most likely involved- 
Select and explain. 
A. Biceps brachii and supinator, B. Flexor digitorum superficialis, C. Extensor carpi radialis longus and brevis, D. Triceps brachii and anconeous
C: Extensor carpi radialis longus and brevis
Answer: C: Extensor carpi radialis longus and brevis 
Explanation: It is a typical case of Tennis elbow. As the patient is having pain when there is stretch on extensor of the forearm by flexing the wrist and fingers with elbow pronated (as in squeezing water out of sponge or towel).