<prompt> Please answer with one of the option in the bracket. Write reasoning in between . Write answer in between .Q:A 26-year-old gravida 4 para 1 presents to the emergency department with sudden severe abdominal pain and mild vaginal bleeding. Her last menstrual period was 12 weeks ago. She describes her pain as similar to uterine contractions. She has a history of 2 spontaneous abortions in the first trimester. She is not complaining of dizziness or dyspnea. On physical examination, the temperature is 36.9C 98.4F, the blood pressure is 12085 mm Hg, the pulse is 95min, and the respiratory rate is 17min. The pelvic examination reveals mild active bleeding and an open cervical os. There are no clots. Transvaginal ultrasound reveals a fetus with no cardiac activity. She is counseled about the findings and the options are discussed. She requests to attempt medical management with mifepristone before progressing to surgical intervention. Which of the following describes the main mechanism of action for mifepristone?? A: Induce teratogenesis in the fetus, B: Induce cervical dilation, C: Increase myometrial sensitivity to contractions and induced decidual breakdown, D: Interferes with cell growth in rapidly dividing cells, E: Interferes with placental blood supply to the fetus,  <response>: This is a multiple choice question about the mechanism of action of mifepristone in the context of a patient with a missed miscarriage at 12 weeks gestation. The stem provides details about the patients history and exam findings confirming a nonviable pregnancy. It asks about the main mechanism of action of mifepristone, which the patient has requested to attempt medical management of her miscarriage. Based on the clinical scenario, we can rule out choices A and E, as mifepristone is not teratogenic and does not affect placental blood supply when used for pregnancy termination. Choice B can also be eliminated, as while mifepristone may help soften and dilate the cervix, that is not its primary mechanism. Choice D describes the general mechanism of antimetabolite drugs, but is not specific to mifepristones action in pregnancy termination. Choice C correctly describes mifepristones mechanism - it blocks progesterone receptors, which increases uterine contractility and causes decidual breakdown. This leads to detachment of the pregnancy tissue and ultimately pregnancy termination, making it the best answer.C: Increase myometrial sensitivity to contractions and induced decidual breakdown 