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
Electromyography is used to: 
Select and explain. 
A. To study muscle activity, B. Determine class II malocclusion, C. Determine the centric relation, D. Determine the centric occlusion
A: To study muscle activity
Answer: A: To study muscle activity 
Explanation: None