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
[{'content': "Marfan's syndrome is due to defect of? \nSelect and explain. \nA. Elastin, B. Collagen, C. Fibrillin, D. Lamillin", 'role': 'user'}, {'content': 'Answer: C \nExplanation: Ans. (c) FibrillinRef.: Management of Genetic Syndromes by Suzanne B. Cassidy, Judith E. Allanson Page 513', 'role': 'assistant'}]