This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: NEET 2018, Subject name: Anatomy
De Quervain's disease is tenosynovitis of 
Select and explain. 
A. Abductor pollicis brevis and extensor pollicis longus, B. Abductor pollicis longus and extensor carpi radialis brevis, C. Abductor pollicis longus and extensor pollicis brevis, D. Abductor pollicis brevis and extensor carpi radialis longus
C: Abductor pollicis longus and extensor pollicis brevis
Answer: C: Abductor pollicis longus and extensor pollicis brevis 
Explanation: -Exterior pollicis brevis & abductor pollicis longus tendons. - form the anterolateral border of anatomical Snuff box. -It occurs d/o repeated overuse of thumb/ wrist paicularly like thumb abduction. -Finkelstien test : Sudden ulnar detion is painful. -Anatomical snuff box Triangular depression on lateral side of wrist seen best when thumb is extended. Boundaries :- -Anterolateral - Abductor policies longus tendon Exterior pollicis brevis tendon -Posteromedial - Exterior pollicis longus tendon -Floor - Scaphoid & trapezium Contents - Radial aery, radial nerve, cephalic vein