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: Unknown
[{'content': 'Not true regarding Giant Cell Tumor \nSelect and explain. \nA. Benign bone tumor, B. Usually solitary, C. Spine involvement is common, D. Age group affected in usually between 20-40 years', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Ans. c (Spine involvement is common) (Ref. Bailey and Love Surgery 25th/pg. 471; Maheshwari orthopaedics 2nd/pg. 215)GIANT CELL TUMOR (OSTEOCLASTOMA)# It is an aggressive but benign tumor of bone.# Occurs most commonly at epiphyseal end of long bones (most common around the knee: distal femur and proximal tibia: 50-65%).# Peak incidence 20-40 years old.# Eccentric, Epiphyseal (subarticulaar), Expansile Benign Bone tumor.# Locally aggressive benign tumor often around the distal femur, proximal tibial region.# Characteristic "soap bubble" appearance on X-ray.# Spindle-shaped cells with multinucleated giant cells.# Tumor invasion of the soft tissue occurs in 25% of cases.# 3\'E\'s of GCT/ Osteoclastoma:- Epiphyseal- Expansile- Eccentric # Bone tumors of epiphyseal origin =>Osteoclastoma (GCT) and Chondroblastoma (Codman\'s tumor).', 'role': 'assistant'}]