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: Pharmacology
Local anaesthetic injected directly into the tissue ? 
Select and explain. 
A. Infiltration anaesthesia, B. Nerve block, C. Field block, D. Bier's block
A: Infiltration anaesthesia
Answer: A: Infiltration anaesthesia 
Explanation: Ans. is 'a' i.e., Infiltration anaesthesia o Infiltration anaesthesia is the injection of local anaesthetic directly into tissue without taking into consideration the course of cutaneous nerve.