This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Cytogenetic Disorders, Subject name: Pathology
Marfan's syndrome is due to defect of? 
Select and explain. 
A. Elastin, B. Collagen, C. Fibrillin, D. Lamillin
C: Fibrillin
Answer: C: Fibrillin 
Explanation: Ans. (c) FibrillinRef.: Management of Genetic Syndromes by Suzanne B. Cassidy, Judith E. Allanson Page 513