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An obstetric resident is preparing to do a nerve block to anesthesize the perineum during delivery. What structure the resident need to palpate to perform this procedure ?

A-Pubic tubercle
B-Ischial spine
C-Ischial tuberosity
D-Cervix
E-Sacrotuberous Ligament

BB

Thank you.

Ischial Spine or Both Spina Iliaca Ant. Sup

Thanks