The following are multiple choice questions (with answers) about medical knowledge.   **Question:** A 30-year-old woman comes to the physician because she has been unable to conceive for 3 years. Analysis of her husband's semen has shown normal sperm counts during this time. The patient also reports episodic pelvic and back pain accompanied by painful diarrhea for 5 years. She has about one such episode on average per month for 4–6 days. She has taken ibuprofen for the pain, which has provided some relief. Menses have occurred at regular 29-day intervals since menarche at the age of 14 years and last for 7 days. She is sexually active with her husband and does not use contraception. Vital signs are within normal limits. Pelvic and bimanual examinations are normal; rectal examination is unremarkable. A hysterosalpingogram 6 months prior showed normal results. Which of the following is the most likely underlying mechanism of this patient's symptoms?   (A) Loss of fallopian tube function following infection   (B) Smooth muscle tumor arising from the myometrium   (C) Endometrial tissue outside the uterine cavity   (D) Increased secretion of androgens and luteinizing hormone
['(C) Endometrial tissue outside the uterine cavity <> answer', 'The following are multiple choice questions (with answers) about medical knowledge. <> instruction', '(A) Loss of fallopian tube function following infection \n (B) Smooth muscle tumor arising from the myometrium \n (C) Endometrial tissue outside the uterine cavity \n (D) Increased secretion of androgens and luteinizing hormone <> possible answers', "  A 30-year-old woman comes to the physician because she has been unable to conceive for 3 years. Analysis of her husband's semen has shown normal sperm counts during this time. The patient also reports episodic pelvic and back pain accompanied by painful diarrhea for 5 years. She has about one such episode on average per month for 4–6 days. She has taken ibuprofen for the pain, which has provided some relief. Menses have occurred at regular 29-day intervals since menarche at the age of 14 years and last for 7 days. She is sexually active with her husband and does not use contraception. Vital signs are within normal limits. Pelvic and bimanual examinations are normal; rectal examination is unremarkable. A hysterosalpingogram 6 months prior showed normal results. Which of the following is the most likely underlying mechanism of this patient's symptoms? <> context@"]