<prompt> Please answer with one of the option in the bracket. Write reasoning in between . Write answer in between .Q:A 15-year-old boy presents with shortness of breath on exertion for the past 2 weeks. Although he does not have any other complaints, he is concerned about not gaining much weight despite a good appetite. His height is 188 cm 6 ft 2 in and weight is 58 kg 124 lb. His blood pressure is 13456 mm Hg and his pulse rate is 78min. On cardiac auscultation, his apex beat is displaced laterally with a diastolic murmur lateral to the left sternal border. Slit-lamp examination shows an upward and outward displacement of both lenses. Synthesis of which of the following proteins is most likely defective in this patient?? A: Fibrillin, B: Laminin, C: Elastin, D: Fibronectin, E: Reticular fibers,  <response>: This is a clinical vignette describing a 15-year-old boy with shortness of breath, low weight for height despite good appetite, displaced apex beat on cardiac exam, diastolic murmur, and lens dislocation on slit lamp exam. These findings are classic for Marfan syndrome. Marfan syndrome is caused by mutations in the FBN1 gene encoding fibrillin-1, which is an important component of microfibrils in the extracellular matrix. Therefore, the defective protein in this patient is most likely fibrillin.A: Fibrillin 