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
Mutation in Marfan’s syndrome is? 
Select and explain. 
A. Collagen I, B. Fibrillin I, C. Collagen II, D. Fibrillin II
B: Fibrillin I
Answer: B: Fibrillin I 
Explanation: Mutations in the fibrillin-1 gene cause Marfan’s syndrome
Mutations in the fibrillin-2 gene have been linked to Beal's Syndrome,