This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Neck, Subject name: Surgery
A 36-year-old man developed neck and left arm pain. He noted paresthesias in the left index and long fingers. He was found to have weakness of the left triceps muscle and a diminished left triceps jerk. His left-sided disc herniation is most likely to be at:- 
Select and explain. 
A. C3-C4, B. C4-C5, C. C5-C6, D. C6-C7
D: C6-C7
Answer: D: C6-C7 
Explanation: DISCUSSION: This patient has all of the neurologic components of the most common cervical disc syndrome, that caused by a herniation at the C6-C7 level with compression of the C7 nerve root.