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': 'The plain X-ray chest finding which suggests syphilitic cardiovascular disease is: \nSelect and explain. \nA. Linear calcification of the ascending aoa, B. Linear calcification of the aoic arch, C. Speckled calcification of the ascending aoa, D. Speckled calcification of the aoic arch', 'role': 'user'}, {'content': 'Answer: A \nExplanation: X-Ray Films showing linear calcification of the ascending aoa suggests asymptomatic syphilitic aoitis. Aeriosclerosis seldom produces this type of calcification in ascending aoa Ref: Harrison, E-18, P-1384', 'role': 'assistant'}]