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: Gynaecology & Obstetrics
In the perspective of the busy life schedule in the modern society, the accepted minimum period of sexual cohabilitation resulting in no offspring for a couple to be declared infeile is : 
Select and explain. 
A. One year, B. One and a half - year, C. Two years, D. Three years
A: One year
Answer: A: One year 
Explanation: One year If a couple fails to achieve pregnancy after one year of "unprotected" and regular inter course, it is an indication to investingate the couple for infeility. Also know : * 90% of couples should conceive after 12 months of unprotected sex. Infeility : - Primary : When no previous pregnancies have occurred. - Secondary : When a prior pregnancy although not necessary although not necessary a live bih, has occurred. Fecundability : is the probability of achieving pregnancy within a single menstrual cycle. Fecundity : is the probability of achieving a live bih within a single menstrual cycle. Absolute Infeility : It results from congenital or acquired irreversible loss of functional gametes in either paner or the absence of uterus in females.