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: Anaesthesia
Anesthetic agent with vasoconstrictor is contraindicated in? 
Select and explain. 
A. Finger block, B. Spinal block, C. Epidural block, D. Regional anesthesia
A: Finger block
Answer: A: Finger block 
Explanation: The use of vasoconstrictors (epinephrine or adrenaline) along with a local anesthetic is usually avoided in case of ring block or finger block as it causes severe vasocontriction (direct alpha adrenergic effect). As this vaso-constriction in the end aeries can lead to gangrene formation. Ref: Neural blockade in clinical anesthesia and management of pain, Issue 494 - Page 124, By Michael J. Cousins, Phillip O. Bridenbaugh; Fundamentals of Surgical Practice By Andrew Kingsnoh, Douglas Bowley, Page 147.