This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Muscles of arm and forearm region & Cubital fossa, Subject name: Anatomy
Content of the star marked triangle 
Select and explain. 
A. Basilic vein and superficial branch of radial nerve, B. Radial aery only, C. Radial aery and Posterior interosseous nerve(PIN), D. Cephalic vein and Posterior interosseous nerve(PIN)
B: Radial aery only
Answer: B: Radial aery only 
Explanation: Marked triangle - Anatomical snuff box Anatomical snuff box -Content - radial aery -Boundaries Anterolaterally - abductor pollicis longus and extensor policis brevis Posteromedially- extensor pollicis longus Floor-styloid process, scaphoid,trapezium Floor-Carpetted by tendons of ECRL,ECRB Roof-Cephalic vein ,Sup. branch of radial nerve