This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Contraception, Subject name: Gynaecology & Obstetrics
Composition of Nova-T : 
Select and explain. 
A. Copper and silver, B. Copper only, C. Copper and selenium, D. Copper and molybdenum
A: Copper and silver
Answer: A: Copper and silver 
Explanation: NOVA-T can be distinguished by a silver core over which the copper wire is wrapped. It has silver added to copper wire increasing it's life span to 5 yrs. PARK'S TEXTBOOK OF PREVENTIVE AND SOCIAL MEDICINE 23rd EDITION PAGE NO 496 Shaw's textbook of Gynecology - 17 th edition, page no. 258.