This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Tumors, Subject name: Orthopaedics
According to Enneking system, not true regarding an active benign tumor is - 
Select and explain. 
A. Intracapsular, B. Margin of reactive bone, C. Thick rim of reactive bone, D. Extended curettage is treatment
C: Thick rim of reactive bone
Answer: C: Thick rim of reactive bone 
Explanation: According to Ennecking staging of benign tumors Stage 2 active : Progressive growth limited by natural barriers Well defined margins but may expand thinning coex Negligible reccurence after marginal recurrence Treatment -marginal resection REF : MAHESWARI 9TH ED