This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Pathology
Mutations in Marfans syndrome is in: 
Select and explain. 
A. Collagen, B. Fibrillin, C. Elastin, D. Fibrin
B: Fibrillin
Answer: B: Fibrillin 
Explanation: Fibrillin