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
The penaz technique 
Select and explain. 
A. Is invasive, B. Uses plethysmography, C. Does not require a pneumatic cuff, D. Is suitable in presence of peripheral vascular disease
B: Uses plethysmography
Answer: B: Uses plethysmography 
Explanation: Penaz technique is a continuous non-invasive method of BP monitoring. Infra-red plethysmograph is mounted on the pneumatic cuff.