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
Local anaesthesia causing methemoglobinemia is an effect of which of the following agents? 
Select and explain. 
A. Prilocaine, B. Etidocaine, C. Ropivacaine, D. Procaine
A: Prilocaine
Answer: A: Prilocaine 
Explanation: reduces the amount of hemoglobin that is available for oxygen transpo this side effect is potentially life threatening. Drugs causing Methemoglobinemia: Sulfonamides Primaquine Nitrobenzene Prilocaine Aminophenones Anilines Ref: Morgan Anaesthesia, 4th Edition, Page 269