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: Anaesthesia
True about Wright's Spirometer is/are 
Select and explain. 
A. Flow rates can be calculated, B. Gives false high values at low flow rates, C. Gives false low values at high flow rates, D. All
A: Flow rates can be calculated
Answer: A: Flow rates can be calculated 
Explanation: A i.e. Flow rates can be calculated