<prompt> In genital TB, the menstrual bloodDoes not contain tuberculidsContain tuberculids on all days of menstruationTuberculids on the first day of menstruation onlyTuberculids on last day of menstruation only  <response>: A Does not contain tuberculids Definitive diagnosis of TB requires isolation of tubercle bacilli via culture. Bacteriological examination of menstrual blood with acid fast bacilli AFB smear and cultures is recommended by some but sensitivity is very low. Menstrual fluid collected within 12 hour after onset of menses cultured was found to be positive for tuberculosis in 10 of cases. 