This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Peripheral nerve injuries, Subject name: Orthopaedics
[{'content': 'Compression of a nerve within the carpal tunnel produces inability to - \nSelect and explain. \nA. Abduct the thumb, B. Adduct the thumb, C. Flex the distal phalanx of the thumb, D. Oppose the thumb', 'role': 'user'}, {'content': 'Answer: D \nExplanation: 9 tendon & 1 nerve pass through carpal tunnel . They are tendons of flexor digitorum superficialis & profundus in a common sheath , tendon of flexor pollicis longus in an independent sheath & the median nerve Median nerve - motor branches in hand are * flexor pollicis brevis : flexes metacarpophalangeal joint of thumb * opponens pollicis : opposes thumb towards the fingers *abductor pollicis brevis : abduction of thumb *first & second lumbricals : fex metacarpophalangeal joints , extend interphalangeal joints Sensory- palmar skin over the lateral three & half digits with their nail beds REF:textbook of ohopedics, John Ebenezer, 4th edition ,pg.no.391', 'role': 'assistant'}]