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': 'Stanford classification is used to represent which of the following? \nSelect and explain. \nA. Aoic rupture, B. Aoic dissection, C. Intramural hematoma, D. Penetrating atheosclerotic ulcer', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Classification of aoic dissections: Stanford classification: Type A involve the ascending aoa independent of site of tear and distal extension. Type B dissections involve transverse and/or descending aoa without involvement of the ascending aoa. DeBakey classification: Type I dissection involves ascending to descending aoa. Type II dissection is limited to ascending or transverse aoa, without descending aoa. Type III dissection involves descending aoa only. Ref: Harrisons Principles of Medicine, 18th Edition, Chapter 248, Figure 248-4, Page 2063', 'role': 'assistant'}]