<prompt> Please answer with one of the option in the bracket. Write reasoning in between . Write answer in between .Q:A 22-year-old female presents to her PCP after having unprotected sex with her boyfriend 2 days ago. She has been monogamous with her boyfriend but is very concerned about pregnancy. The patient requests emergency contraception to decrease her likelihood of getting pregnant. A blood hCG test returns negative. The PCP prescribes the patient ethinyl estradiol 100 mcg and levonorgestrel 0.5 mg to be taken 12 hours apart. What is the most likely mechanism of action for this combined prescription?? A: Inhibition or delayed ovulation, B: Alteration of the endometrium impairing implantation of the fertilized egg, C: Thickening of cervical mucus with sperm trapping, D: Tubal constriction inhibiting sperm transportation, E: Interference of corpus luteum function,  <response>: This is a question about the mechanism of action of emergency contraception containing ethinyl estradiol and levonorgestrel. The patient is concerned about pregnancy after having unprotected sex and tests negative for pregnancy. The doctor prescribes her two doses of emergency contraception containing estrogen ethinyl estradiol and progestin levonorgestrel to be taken 12 hours apart. The question asks about the most likely mechanism of action of this combined prescription.Choice A discusses inhibition or delay of ovulation, which is a key mechanism of action of emergency contraception. The estrogen and progestin work to disrupt the hormonal environment and prevent or delay ovulation. Choice B discusses alteration of the endometrium, which may play a role but is likely not the primary mechanism. Choice C discusses thickening cervical mucus to trap sperm. This is not a likely mechanism of action for this oral medication. Choice D discusses tubal constriction, which is not a known mechanism of this medication. Choice E discusses corpus luteum function. The corpus luteum produces progesterone after ovulation, so this choice does not make sense for emergency contraception taken before ovulation.A: Inhibition or delayed ovulation 