Which of the following arterial sites is most commonly used to obtain a blood pressure reading?

A) Brachial
B) Femoral
C) Radial
D) Ulnar

The brachial artery, located in the upper arm, is the most commonly used site for obtaining a blood pressure reading. This is because it is easily accessible and provides accurate measurements of systemic arterial pressure. The femoral artery is typically used in emergency situations and the radial and ulnar arterial sites are more commonly used for assessing blood flow to specific areas of the hand.