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: Medicine
[{'content': "A young, tall, thin, male with archnodactyly has ectopia lentis in both eyes. The most likely diagnosis is \nSelect and explain. \nA. Marfan's syndrome, B. Marchesani's syndrome, C. Homocystinuria, D. Ehler's danlos syndrome", 'role': 'user'}, {'content': "Answer: A \nExplanation: Answer is A (Marfan's syndrome): Arachnodactyly and ectopia lends (dislocation of lens) in tall thin male suggests a charachteristic diagnosis of Marfan's syndrome. Marfan Syndrome : Review Marfan's syndrome is a genetic disorder of the connective tissue of the body manifested principally by changes in the skeleton, eye and cardiovascular system.", 'role': 'assistant'}]