This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Skeletal infections, Subject name: Anatomy
All are True about HIV, with chronic osteomyelitis except 
Select and explain. 
A. necrosis absent, B. often bilateral, C. periosteal new bone formation, D. most common cause is staphylococcus aureus
A: necrosis absent
Answer: A: necrosis absent 
Explanation: Osteomyelitis in AIDS: Osteomyelitis ,which rarely develops in patients with AIDS, is monomicrobial in 50% of patients and polumicrobial in 35% with remaining showing no organism. Staphylococcus is the most common organism and often it is bilateral. As pathophysiology of osteomyelitis is not altered, all the pathological changes seen in osteomyelitis are seen in AIDS also. Dead necrotic bone periosteal reaction . ref : maheswari 9th ed