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
[{'content': 'Composition of Nova-T is _______ \nSelect and explain. \nA. Copper and silver, B. Copper and aluminium, C. Copper only, D. Copper and selenium', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Composition of Nova-T is copper and silver Copper carrying devices: In these, copper wire of surface area 200 to 250mm is wrapped round the veical stem of a polypropylene frame. Among these devices are copper T 200, Copper 7, Multiload copper 250, Cop-per T 380, Copper T 220 and Nova T. They have an effective life of about 3-5 years. It is estimated that about 50 mcg of copper is elute daily in the uterus. Copper T 380, known as Paraguard, has a lifespan of 1 years. Nova-T had silver added to the copper wire, thereby increasing its lifespan to 5 years. IUCDs are a good contraceptive choice for the following groups of women: Low-risk of STD. Multiparous woman Monogamous relationship Desirous of long-term reversible method of contraception, but not yet desirous of permanent sterilization Unhappy or unreliable users of oral contrception or barrier contraception Uses of IUCD: As a contraceptive Postcoital contraception (emergency contraception) Preferably avoid its use in unmarried and nulliparous patients because of the risk of PID and subsequent tubal infeility. Ref: Shaw&;s textbook of Gyaecology 17th edition Pgno: 258', 'role': 'assistant'}]