This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Muscles of arm and forearm region & Cubital fossa, Subject name: Anatomy
[{'content': 'A secretary comes to you complaining of pain in her wrists from typing all day. You determine she likely has carpal tunnel syndrome. Which of the following condition would help you determine the diagnosis? \nSelect and explain. \nA. Inability to adduct little finger, B. Inability to flex distal interphalangeal joint of ring finger, C. Flattened thenar eminence, D. Loss of skin sensation of medial one and half fingers', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Carpal tunnel contains median nerve and tendons of flexor pollicis longus, flexor digitorum profundus, and flexor digitorum superficialis muscles. It results from injury to median nerve, which supplies the thenar muscle. Thus, injury to this nerve causes flattened thenar eminence. Middle finger has no attachment for adductors. Ulnar nerve innervates: - medial half of flexor digitorum profundus muscle, which allows flexion of DIP joints of ring and little fingers. - skin over medial one and half fingers and adductor pollicis muscle.', 'role': 'assistant'}]