This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Head and neck, Subject name: Anatomy
False about sternocleidomastoid is 
Select and explain. 
A. Arises from sternum and clavicle, B. Inses on mastoid process, C. Motor supply by spinal accessory nerve, D. Tilt the head on opposite side
D: Tilt the head on opposite side
Answer: D: Tilt the head on opposite side 
Explanation: Actions of sternocleidomastoid - When one sternocleidomastoid muscle contracts, a) It turn the chin to the opposite side, b) It can also tilt the head towards the shoulder of same side Ref : B D Chaurasia's Human Anatomy , sixth edition, volume 3 , pg. no. 89