This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Orthopedics, Subject name: Surgery
A 43-year-old man had a previous injury to his wrist. The ulnar nerve was severed, as indicated by which of the following? 
Select and explain. 
A. Claw hand involving the ring and little fingers, B. Claw hand involving the index and middle fingers, C. Atrophy of the thenar muscles, D. Absent sensation in the index finger
A: Claw hand involving the ring and little fingers
Answer: A: Claw hand involving the ring and little fingers 
Explanation: The lumbrical muscles arise from the flexor digitorum profundus tendons at a level distal to the small bones in the hand. The hypothenar muscles are on the ulnar side, and the thenar muscles are on the thumb side of the hand. The medial two lumbrical muscles are paralyzed, and this leads to the typical deformity.