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
Dose of lignocaine for spinal anesthesia is `)/0 of: 
Select and explain. 
A. 5, B. 25, C. 50, D. 75
A: 5
Answer: A: 5 
Explanation: 5%