This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Anatomy
[{'content': 'The thumb action that is totally affected in radial nerve trauma - \nSelect and explain. \nA. Abduction, B. Adduction, C. Extension, D. Flexion', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Radial nerve injury\n-\xa0\xa0\xa0\xa0\xa0\xa0\xa0\xa0High radial nerve palsy- Injury above the spiral groove.\no\xa0\xa0\xa0Paralysis of all muscles supplied by radial nerve.\no\xa0\xa0\xa0Clinical features\n\nWrist drop, finger drop, thumb drop\nExtension affected of- elbow, wrist, thumb and fingers\nSensation affected of- posterior surface of arm and forearm and lower lateral half of forearm.\n\n-\xa0\xa0\xa0\xa0\xa0\xa0\xa0\xa0Low radial nerve palsy- Injury below the spiral groove.\no\xa0\xa0\xa0Type I- Injury between spiral groove and elbow.\n\nElbow extensors are spared- Triceps and Anconeus.\nWrist, thumb and finger extensors paralysed- wrist drop, thumb drop, finger drop.\nLoss of sensation on dorsal side of first web space.\n\no\xa0\xa0\xa0Type II- Injury below the elbow joint.\n\nElbow and wrist extensors spared\nThumb and finger extensors paralysed.(extensor digitorum, extensor digiti minimi, extensor indicis, extensor pollicis longus, extensor pollicis brevis)- Thumb drop and finger drop.\nLoss of sensation on dorsal side of first web space.', 'role': 'assistant'}]