This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Upper limb : Miscellaneous, Subject name: Anatomy
[{'content': 'Medial boundary of the anatomical snuffbox is formed by: \nSelect and explain. \nA. Extensor pollicis brevis, B. Extensor carpi radialis longus, C. Extensor pollicis longus, D. Extensor carpi radialis brevis', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Anatomical snuff box is lined posteromedially - extensor Pollicis longus Anterolaterally - extensor pollicis brevis and abductor pollicis longus. floor - scaphoid,trapezium, base of 1st metacarpal and styloid process of radius. content - radial aery (Pulse can be felt by palpating radial aery against scaphoid bone.', 'role': 'assistant'}]