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
Minimum alveolar concentration is an indicator of 
Select and explain. 
A. Efficacy of anaesthetic, B. Potency of anaesthetic, C. Rate of onset of action, D. None
B: Potency of anaesthetic
Answer: B: Potency of anaesthetic 
Explanation: MAC indicates potency of inhalational anaesthetic agent.