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
Fluoride content is least – 
Select and explain. 
A. Methoxyflurane, B. Enflurane, C. Isoflurane, D. Sevoflurane
C: Isoflurane
Answer: C: Isoflurane 
Explanation: Amongst the given options isoflurane produces minimum fluoride.

Methoxyflurane → 50 m
Sevoflurane → 30 - 50 m
Enflurane → 20 - 25 in
Isoflurane → 4 - 8 m
Halothane → Only in anaerobic conditions
Desflurane → Zero