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
Titanium casting is done with 
Select and explain. 
A. Laser, B. Oven, C. Gas torch, D. Arc Melting with an argon atmosphere
D: Arc Melting with an argon atmosphere
Answer: D: Arc Melting with an argon atmosphere 
Explanation: None