<prompt> Please answer with one of the option in the bracket. Write reasoning in between . Write answer in between .Q:A 28-year-old man presents for a pre-placement health check-up. Auscultation reveals a mid-systolic click. An echocardiogram reveals a floppy mitral valve and a dilated aortic root. An ocular examination finds a subluxated lens superior and laterally. What is the most likely genetic defect?? A: NF1 protein, B: Cystathionine synthase deficiency, C: Fibrillin, D: Dystrophin, E: Spectrin,  <response>: This is a clinical vignette describing a 28-year-old man with findings of a mid-systolic click on cardiac auscultation, floppy mitral valve and dilated aortic root on echocardiogram, and ectopia lentis on eye exam. The key findings are cardiovascular abnormalities and ectopia lentis, which point towards a connective tissue disorder. Specifically, the combination of aortic root dilation and ectopia lentis is classic for Marfan syndrome, which is caused by mutations in the fibrillin gene.C: Fibrillin 