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: Microbiology
[{'content': 'A 25-year-old IV drug abuser presents with fever for 3 weeks. ECHO shows tricuspid vegetation. The most likely organism associated with endocarditis in this case is: \nSelect and explain. \nA. Staph. aureus, B. Candida albicans, C. Pseudomona, D. Strep. viridans', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Ans. (a) Staph. aureus Endocarditis in IV drugs addicts Right sided (more common) Left sided Staph. aureus Varied (Stapti, aureus, enterobacter, polymicrobial)', 'role': 'assistant'}]