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': 'Klumpke’s paralysis involves? \nSelect and explain. \nA. C8T1, B. C6 C7, C. C7T1, D. C5 C6', 'role': 'user'}, {'content': "Answer: A \nExplanation: KLUMPKE'S PARALYSIS: Site of injury: lower trunk of brachial plexus Cause of injury: undue abducon of the arms Nerve roots involved: mainly T1 partly C8 Muscles paralyzed: Intrinsic muscles of the hand (Tl) Ulnar flexors of wrist and fingers (C8)\nDisability: 1. Claw hand 2. Horner's syndrome 3. Vasomotor changes 4. Trophic changes 5. Cutaneous anesthesia on the ulnar border of hand and forearm", 'role': 'assistant'}]