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
The following is used to assess breathing pattern: 
Select and explain. 
A. Spirometry, B. Barometer, C. All, D. None
A: Spirometry
Answer: A: Spirometry 
Explanation: Spirometry: It is the most common of the lung function tests It is used to assess breathing patterns and diseases like cystic fibrosis,asthama, pulmonary fibrosis,COPD Ref: Guyton and Hall textbook of medical physiology 12th edition, page number:324,325