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: Dental
The oxygen consumption of normal gingiva is: 
Select and explain. 
A. 1.6	± 0.3, B. 0.9	± 0.22, C. 2.7	± 0.41, D. 1.9	± 0.21
A: 1.6	± 0.3
Answer: A: 1.6	± 0.3 
Explanation: None