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
Klumpke's paralysis from a brachial plexus injury involves which of the following nerve cords? 
Select and explain. 
A. C5, C6, B. C6, C7, C. C7, T1, D. C8, T1
D: C8, T1
Answer: D: C8, T1 
Explanation: Klumpke's paralysis is a form of paralysis involving the muscles of the forearm and hand, resulting from a brachial plexus injury in which the eighth cervical (C8) and first thoracic (T1) nerves are injured either before or after they have joined to form the lower trunk.