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: Medicine
1% w/v of methylene blue is injected intravenously into the tissue to reverse the toxic effects of 
Select and explain. 
A. Methaemoglobinemia, B. Oxygen toxicity, C. Crohn's disease, D. Lidocaine toxicity
A: Methaemoglobinemia
Answer: A: Methaemoglobinemia 
Explanation: None