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: Pharmacology
Nausea and vomiting postoperatively can be because of all except 
Select and explain. 
A. Blood ingested, B. N2O, C. Opioid, D. Acetaminophen
D: Acetaminophen
Answer: D: Acetaminophen 
Explanation: None