This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Peripheral Nerve Injury, Subject name: Orthopaedics
Froment's Sign is seen in: 
Select and explain. 
A. Ulnar nerve palsy, B. Median nerve palsy, C. Musculocutaneous nerve palsy, D. Posterior Interosseous nerve palsy
A: Ulnar nerve palsy
Answer: A: Ulnar nerve palsy 
Explanation: Froment Sign: In case of ulnar nerve palsy adductor pollicis supplied by ulnar nerve is paralysed. S o, patient holds the book between thumb and palm by using flexor pollicis longus (supplied by AIN nerve) . This produces flexion at inter-phalangeal joint, while holding book.