This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Hand, Subject name: Anatomy
[{'content': 'The medial boundary of the anatomical snuffbox is formed by the: \nSelect and explain. \nA. Ext. Pollicus brevi, B. Ext Carpi radialis longus, C. Extensor pollicus longus, D. Ext Carpi radialis brevis', 'role': 'user'}, {'content': "Answer: C \nExplanation: Ans. (c) Extensor pollicus longusGray's 41st ed./790* The anatomical snuffbox is formed by the tendons of extensor polloicis longus and brevis, and abductor pollicis longus.* The radial artery running in the floor of the snuffbox, and the radial nerve passing to the dorsum of the hand.* Boundaries of snuffbox:# Postero-medial border is the tendon of the extensor pollicis longus.# Antero-lateral border is a pair of parallel and intimate tendons of the extensor pollicis brevis and the abductor pollicis longus.# The proximal border is formed by the styloid process of the radius.# The distal border is formed by the approximate apex of the schematic snuffbox isosceles.", 'role': 'assistant'}]