This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: General surgery, Subject name: Surgery
In a ulcer over skin if there is undermined edges it suggests 
Select and explain. 
A. Syphilis, B. Tuberculosis, C. Cancerous ulcer, D. Venous ulcer
B: Tuberculosis
Answer: B: Tuberculosis 
Explanation: Flat sloping venous or septic, often with a transparent healing edge along pa of its circumference. Punched-out syphilitic, trophic, diabetic, ischaemic, leprosy. Undermined tuberculosis, pressure necrosis paicularly over the buttocks, carbuncles. Raised rodent ulcer , often with a slightlyrolled appearance. Raised and eveed carcinoma Hamilton bailey 19th edition Pg 64