This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Upper limb, Subject name: Anatomy
[{'content': 'Boundaries of anatomical snuffbox are all except \nSelect and explain. \nA. Abductor pollicis longus, B. Extensor pollicis longus, C. Extensor pollicis brevis, D. Extensor carpi ulnaris', 'role': 'user'}, {'content': 'Answer: D \nExplanation: ANATOMICAL SNUFF BOX:-Is a triangular depression on the lateral side of the wrist. It is seen best when the thumb is extended. BOUNDARIES:1. Anterior-tendon of abductor pollicis longus, tendon of extensor pollicis brevis.2. Posterior-tendon of extensor pollicis longus.3. Floor-scaphoid and trapezium.4. Above by styloid process of the radius Contents:-1. Radial aery.2. Cephalic vein.3. Radial nerve. REF: BD Chaurasia 7th edition page no:136.', 'role': 'assistant'}]