<prompt> Please answer with one of the option in the bracket. Write reasoning in between . Write answer in between .Q:A 53-year-old patient presents to his primary care provider with a 1-week history of abdominal pain at night and between meals. He has attempted taking antacids, which help briefly, but then the pain returns. The patient has not noticed any changes to the color of his stool but states that he has been having some loose bowel movements. The patient reports that he has had duodenal ulcers in the past and is concerned that this is a recurrence. On exam, his temperature is 98.4F 36.9C, blood pressure is 13084 mmHg, pulse is 64min, and respirations are 12min. The abdomen is soft, nontender, and nondistended in clinic today. A fecal occult blood test is positive for blood in the stool. During outpatient workup, H. pylori stool antigen is negative, endoscopy demonstrates duodenal ulcers, and gastrin levels are elevated after a secretin stimulation test. Which of the following should also be examined in this patient?? A: Calcitonin, B: Parathyroid hormone, C: Plasma metanephrines, D: Thyroid stimulating hormone, E: Vasoactive intestinal peptide,  <response>: This is a clinical vignette describing a 53-year-old male with a history of duodenal ulcers presenting with abdominal pain and loose stools. Key findings include elevated gastrin levels after secretin stimulation test and endoscopic evidence of duodenal ulcers. The question asks which additional test should be examined in this patient. Based on the clinical presentation and workup findings, this patient likely has Zollinger-Ellison syndrome, which is caused by a gastrin-secreting tumor. Elevated gastrin levels stimulate increased gastric acid production, leading to peptic ulcers. Choice A, calcitonin, and choice D, TSH, are hormones unrelated to this condition. Choice C, plasma metanephrines, tests for pheochromocytoma, which does not fit this presentation. Choice B, parathyroid hormone, is the most relevant as hyperparathyroidism can be associated with Zollinger-Ellison syndrome. Choice E, VIP, is also plausible as some VIP-secreting tumors can cause ulcers and diarrhea. However, hyperparathyroidism has a stronger association with Zollinger-Ellison syndrome.B: Parathyroid hormone 