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: Pathology
The nurse is assessing the motor function of an unconscious male client. The nurse would plan to use which plan to use which of the following to test the client’s peripheral response to pain? 
Select and explain. 
A. Sternal rub, B. Nail bed pressure, C. Pressure on the orbital rim, D. Squeezing of the sternocleidomastoid muscle
B: Nail bed pressure
Answer: B: Nail bed pressure 
Explanation: Motor testing in the unconscious client can be done only by testing response to painful stimuli. Nail bed pressure tests a basic peripheral response.
Options A, C, and D: Cerebral responses to pain are tested using the sternal rub, placing upward pressure on the orbital rim, or squeezing the clavicle or sternocleidomastoid muscle.