Step 1: Genital tuberculosis, including tuberculous endometritis, is almost always secondary to a focus elsewhere and spreads to reach the fallopian tubes first and then the endometrium.
Step 2: The most common presenting complaint of genital TB is infertility, reported in about 35 to 60 percent of patients, which makes option (b) correct.
Step 3: Infertility results either from blockage and destruction of the fallopian tubes or from loss of tubal function and damaged endometrium even when the tubes remain patent, so implantation fails.
Step 4: Abdominal or pelvic pain (a), menstrual changes such as amenorrhoea or hypomenorrhoea (c) and vaginal discharge (d) can all occur but they are less frequent than infertility, which is the leading reason these women seek care.