The following are multiple choice questions (with answers) about medical knowledge.   **Question:** A 28-year-old primigravid woman at 39 weeks gestation is admitted to the hospital in active labor. On examination, the cervix is 100% effaced and 10 cm dilated. After 5 minutes of pushing, there is a prolonged deceleration of the fetal heart rate to 90/min. A decision to perform an episiotomy is made to expedite vaginal delivery. The anesthesiologist locates the ischial spines by palpating the posterolateral vaginal sidewall and administers an anesthetic. Three minutes later, pinching the posterior vulva does not provoke pain. The anesthetized nerve most likely also supplies which of the following structures?   (A) Skin of the lateral thigh   (B) External anal sphincter   (C) Skin of the mons pubis   (D) Detrusor muscle
['(B) External anal sphincter <> answer', 'The following are multiple choice questions (with answers) about medical knowledge. <> instruction', '(A) Skin of the lateral thigh \n (B) External anal sphincter \n (C) Skin of the mons pubis \n (D) Detrusor muscle <> possible answers', '  A 28-year-old primigravid woman at 39 weeks gestation is admitted to the hospital in active labor. On examination, the cervix is 100% effaced and 10 cm dilated. After 5 minutes of pushing, there is a prolonged deceleration of the fetal heart rate to 90/min. A decision to perform an episiotomy is made to expedite vaginal delivery. The anesthesiologist locates the ischial spines by palpating the posterolateral vaginal sidewall and administers an anesthetic. Three minutes later, pinching the posterior vulva does not provoke pain. The anesthetized nerve most likely also supplies which of the following structures? <> context@']