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: Surgery
Hypoglycemia may occur in a patient taking insulin and undergoing extraction when 
Select and explain. 
A. Extraction is done on empty stomach, B. Patient had an infection, C. Patient had no exercise in the morning, D. Patient consumed breakfast before extraction
A: Extraction is done on empty stomach
Answer: A: Extraction is done on empty stomach 
Explanation: None