- A Endometriosis and pelvic inflammatory disease (PID) from STIs
- B Hypothyroidism and iron-deficiency anaemia affecting systemic oxygen transport
- C Vitamin D deficiency and osteoporosis affecting skeletal calcium balance
- D Uterine fibroids alone, growing within the myometrial wall of the uterus
Correct answer: A. Endometriosis and pelvic inflammatory disease (PID) from STIs
Explanation: Endometriosis (ectopic endometrial tissue causing adhesions) and PID (often from untreated gonorrhoea or chlamydia) are major causes of tubal factor infertility due to scarring and blockage of fallopian tubes.
Concept context
Understand reproductive health, family planning, contraception methods, STIs, population control, and assisted reproductive technologies.