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
Gold with highest strength and can be used in stress bearing area: 
Select and explain. 
A. Gold foil, B. Mat gold, C. Spherical gold, D. Electralloy
D: Electralloy
Answer: D: Electralloy 
Explanation: Electralloy: It is the newest form of direct filling gold. It is produced by electrolytic precipitation method. Then this crystalline structure is sandwiched between two gold foils to improve the handling properties. In this, calcium (0.1%) is added to increase the hardness and strength of the gold.
Nisha Garg, Amit Garg. Textbook of Operative Dentistry.  Edition 3. Page: 374