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: Medicine
Jaw tightness in proximal temporal arteries.diagnosis - 
Select and explain. 
A. PAN, B. Coarctation of aorta, C. Giant cell arteritis, D. Wegner's granulomatosis
C: Giant cell arteritis
Answer: C: Giant cell arteritis 
Explanation: None