This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Regional anaesthesia, Subject name: Anaesthesia
In Bier's block anaesthetic agent given by which route 
Select and explain. 
A. Intravenous, B. Peribulbar region, C. Retrobulbar area, D. Dermal
A: Intravenous
Answer: A: Intravenous 
Explanation: Biers&;s block is intravenous regional anaesthesia