This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Upper limb, Subject name: Anatomy
Shrugging muscle among the following? 
Select and explain. 
A. Trapezius, B. Rhomboid minor, C. Serratus anterior, D. Latissimus dorsi
A: Trapezius
Answer: A: Trapezius 
Explanation: MuscleNerve supplyActionsTrapeziusSpinal pa of the accessory nerve is motor.Branches from C3, C4 are proprioceptiveUpper fibers act with levator scapulae and elevatethe scapula, as in shruggingMiddle fibers act with rhomboids and retract thescapulaUpper and lower fibers act with serratus anterior and rotate the scapula forwards around the chest wall thus playing an impoant role in the abduction of the arm beyond 90oSteadies the scapulaRef: Chaurasia; Volume 1; 6th edition; Page no: 62