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
Froment signs is positive in injury of which nerve? 
Select and explain. 
A. Median, B. Ulnar, C. Radial, D. None of the above
B: Ulnar
Answer: B: Ulnar 
Explanation: Ans. is 'b' i.e.,Ulnar