This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Monitoring in Anesthesia, Subject name: Anaesthesia
All are the methods of Aerial blood pressure monitoring except 
Select and explain. 
A. Capnography, B. Radial aery cannulation, C. Oscillometry, D. Aerial Tonometry
A: Capnography
Answer: A: Capnography 
Explanation: Cardiovascular monitoring Noninvasive Aerial Blood Pressure monitoring methods : Palpation Doppler Auscultation Oscillometry Aerial Tonometry Invasive Aerial Blood Pressure monitoring method Aerial cannulation ( eg : radial, ulnar, femoral ,etc) Pulmonary aery catheterization Central venous catheterization Cardiac output measurement Thermodilution Dye Dilution Pulse Contour Devices Esophageal Doppler Thoracic Bioimpedance Fick Principle Echocardiography Transthoracic echocardiography (TTE) Transesophageal echocardiography (TEE) Capnography : It is Non Cardiovascular monitoring method