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: Dental
Stress in cold working can be relieved by: 
Select and explain. 
A. Age hardening, B. Annealing, C. Hydrochloric acid, D. Beating
B: Annealing
Answer: B: Annealing 
Explanation: None