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: Anatomy
Compartment involved in Dequervian's tenosynovitis 
Select and explain. 
A. I, B. II, C. V, D. VI
A: I
Answer: A: I 
Explanation: Extensor pollicis brevis and abductor pollicis longus are invovled in Dequervian's tenosynovitis.
The condition is tested using FRINKELSTEIN test.