<prompt> Please answer with one of the option in the bracket. Write reasoning in between . Write answer in between .Q:A 62-year-old woman referred to the cardiology clinic for the evaluation of fatigue and dyspnea for 4 months. She also has loose stools 24 per day, palpitations, and non-pitting edema up to her mid-calf. On examination, vital signs are unremarkable, but she appears to be flushed with mild bilateral wheezes can be heard on chest auscultation. Cardiovascular examination reveals a grade 26 holosystolic murmur at the left mid-sternal area, which is louder during inspiration. Basic laboratory investigations are unremarkable. Echocardiography reveals moderate to severe right ventricular dilatation with severe right ventricular systolic dysfunction. A CT of the chest and abdomen reveals a solid, non-obstructing 2 cm mass in the small intestine and a solid 1.5 cm mass in the liver. What is the most likely cause of her symptoms?? A: Systemic mastocytosis, B: Carcinoid tumor, C: Bronchial asthma, D: Whipples disease, E: Irritable bowel syndrome,  <response>: This is a clinical case scenario describing a 62-year-old woman with symptoms of fatigue, dyspnea, loose stools, palpitations, edema, and findings of a holosystolic murmur, right ventricular dilatation and dysfunction on echocardiography, and small intestinal and liver masses on CT. The key findings pointing to the diagnosis are:- Flushing and wheezing suggest mediator release - Holosystolic murmur suggests tricuspid regurgitation - Right heart dilatation and dysfunction suggest right heart failure- Small bowel and liver masses suggest carcinoid tumorThe symptoms, physical exam findings, and imaging results are classic for carcinoid syndrome due to metastatic carcinoid tumor. The other choices do not explain the constellation of findings.B: Carcinoid tumor 