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: Medicine
Pronator drip is a sign of - 
Select and explain. 
A. UMN lesion of upper limb, B. LMN lesion, C. Dorsal syringomyelia, D. Carpel tunnel syndrome
A: UMN lesion of upper limb
Answer: A: UMN lesion of upper limb 
Explanation: None