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: Unknown
Dequervain's tenosynovitis is a stenosing tenosynovitis of the 
Select and explain. 
A. Tendo Achilles, B. Iliolumbar ligament, C. First extensor compartment of the wrist, D. Median nerve
C: First extensor compartment of the wrist
Answer: C: First extensor compartment of the wrist 
Explanation: Dequervain's tenosynovitis is a stenosing tenosynovitis of the first exten­sor compartment at the wrist comprising the tendons of extensor pollicis brevis and Abductor pollicis longus.