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: Unknown
Mutation in Marfan's syndrome is ? 
Select and explain. 
A. Collagen I, B. Collagen IV, C. Fibrillin I, D. Fibrillin II
C: Fibrillin I
Answer: C: Fibrillin I 
Explanation: ANSWER: (C) Fibrillin IREF: Management of Genetic Syndromes by Suzanne B. Cassidy Judith E. Allanson Page 513Repeat Pathology 2012 Session 1, June 2011