1. A 53-year-old wom an com plained to her physician that the drug she was taking did not work and that she was still suffering from obstinate constipation. The wom an had a long history of irritable...

1. A 53-year-old wom an com plained to her physician that the drug she was taking did not work and that she was still suffering from obstinate constipation. The wom an had a long history of irritable bowel syndrom e and took several drugs in the past w ith lim ited success. She was presently taking lactulose. The physician decided to try another drug recently approved for irritable bowel syndrom e w ith constipation in adult wom en. The drug is a prostanoid derivative that acts by opening type 2 chloride channels in the sm all intestine. Which of the follow ing drugs was m ost likely prescribed? A. Ondansetron B. Dronabinol C. Lubiprostone D. Metoclopram ide E. Diphenhydram ine F. Sorbitol