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: Physiology
Which of the following statement regarding measurement of BP with sphygmomanometer versus intra aerial pressure measurements is true? 
Select and explain. 
A. It is less than intravascular pressure, B. It is more than intravascular pressure, C. It is equal to intravascular pressure, D. It depends upon blood flow
B: It is more than intravascular pressure
Answer: B: It is more than intravascular pressure 
Explanation: The measurement of aerial pressure using a sphygmomanometer bag with a standard arm cuff is subject to inaccuracy leading to falsely high aerial pressure readings. Using sphygmomanometer blood flow is detected. The accuracy of blood pressure measurement is affected by the cuff size. Inadequate cuff size result in falsely elevated blood pressure reading. A large cuff size result in falsely low reading. Ref: Medicine for Anaesthetists By Michael Douglas Vickers, Ian Power, Ppage 285; Critical Care Study Guide: Text and Review By Gerard J. Criner, Page 157.