This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Respiratory system, Subject name: Physiology
In which of the following conditions oxygen delivery is least to muscles? 
Select and explain. 
A. Person inhaling 100 percent oxygen at the top of mout everest, B. Marathon runner at sea level, C. Person with carbon monoxide poisoning, D. None of the above (this option none of the above was also there)
C: Person with carbon monoxide poisoning
Answer: C: Person with carbon monoxide poisoning 
Explanation: In person suffering from carbon monoxide poisoning , perfusion to the muscle is least Ref: guyton and hall textbook of medical physiology 12 edition page number:353,354,355