Step 2 - Medicine 2013

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A 28-year-old patient complains of infertility. The patient has been married for 4 years, has regular sexual life and does not use contraceptives but has never got pregnant. Examination revealed normal state of the genitals, tubal patency. Basal body temperature recorded over the course of 3 consecutive menstrual cycles appeared to have a single phase. What is the most likely cause of infertility?

Anovulatory menstrual cycle
Ovulatory menstrual cycle
Chronic salpingoophoritis
Immunological infertility
Genital endometriosis