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
Regarding the anatomical snuffbox, which of the following is true? 
Select and explain. 
A. Abductor pollicis longus forms the posterior wall, B. Abductor pollicis longus and Extensor pollicis brevis form the anterior wall, C. Basilica vein forms the roof, D. Floor is formed by Extensor carpi radialis longus and brevis
B: Abductor pollicis longus and Extensor pollicis brevis form the anterior wall
Answer: B: Abductor pollicis longus and Extensor pollicis brevis form the anterior wall 
Explanation: Boundaries of anatomical snuff box :

Anterior / Lateral wall - Extensor pollicis brevis and abductor pollicis longus tendons. 
Posterior / medial wall - Extensor pollicis longus tendon.
Floor - Styloid process of radius, trapezium, scaphoid and base of first metacarpal.
Roof - Skin, fascia, starting of cephalic vein, superficial branch of radial nerve.
Content - radial artery.