<prompt> Please answer with one of the option in the bracket. Write reasoning in between . Write answer in between .Q:A 45-year-old man presents to the emergency department with abdominal distension. The patient states he has had gradually worsening abdominal distension with undulating pain, nausea, and vomiting for the past several months. The patient does not see a physician typically and has no known past medical history. He works as a farmer and interacts with livestock and also breeds dogs. His temperature is 98.7F 37.1C, blood pressure is 15990 mmHg, pulse is 88min, respirations are 15min, and oxygen saturation is 99 on room air. Physical exam is notable for mild abdominal distension and discomfort to palpation of the upper abdominal quadrants. Laboratory values are ordered and are notable for a mild eosinophilia. A CT scan of the abdomen demonstrates multiple small eggshell calcifications within the right lobe of the liver. Which of the following is the most likely etiology of this patients symptoms?? A: Echinococcus granulosus, B: Enterobius vermicularis, C: Necator americanus, D: Taenia saginata, E: Taenia solium,  <response>: This is a patient with abdominal distension, pain, nausea, and vomiting that has been gradually worsening over several months. He has no significant past medical history. Relevant clues include his occupation as a farmer who interacts with livestock and breeds dogs, mild eosinophilia on lab work, and CT findings of eggshell calcifications in the liver. Echinococcus granulosus causes cystic echinococcosis and produces cysts in organs such as the liver that can calcify and appear similar to eggshells on imaging. This parasite requires both livestock and canine hosts to complete its life cycle, which fits with this patients occupational exposures. Eosinophilia can also occur with parasitic infections. The other answer choices are intestinal worms that would not cause the eggshell calcifications seen on this patients CT scan.A: Echinococcus granulosus 