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: Orthopaedics
The first sign of Volkman's ischemia is - 
Select and explain. 
A. Paresthesia, B. Pain on passive extension of fingers, C. Pain on active extension of fingers, D. Swelling of fingers
B: Pain on passive extension of fingers
Answer: B: Pain on passive extension of fingers 
Explanation: Stretch pain is the earliest sign of impending compartment syndrome. The ischemic muscles, when stretched, give rise to pain.