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
Which of the following is not a sign of successful stellate ganglion block? 
Select and explain. 
A. Nasal stuffiness, B. Guttmansign, C. Horner's syndrome, D. Bradycardia
D: Bradycardia
Answer: D: Bradycardia 
Explanation: Bradycardia is not an established sign of successful stellate ganglion block. Ref: Sho Textbook of Anesthesia By Ajay Yadav, 2nd Edition, Page 113; Image-Guided Intervention By Matthew A. Mauro, Kieran Murphy, Kenneth Thomson, Christoph L. Zollikofer, 2008, Page 1741; Atlas of Image-Guided Intervention in Regional Anesthesia and Pain Medicine By James P. Rathmell, 2005, Page 115