This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: General anaesthesia, Subject name: Anaesthesia
Which among the following used as a pre-anaesthetic medication causes the longest amnesia? 
Select and explain. 
A. Diazepam, B. Lorazepam, C. Midazolam, D. Flunitrazepam
B: Lorazepam
Answer: B: Lorazepam 
Explanation: The longest amnesia is produced by lorazepam although half-life of lorazepam (15 hours) is shoer than diazepam (36 hours) and this is probably because of its strong receptor binding potential.