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
Blood culture is positive in which infection of staph. aureus- 
Select and explain. 
A. TSS, B. SSSS, C. Infective endocarditis, D. Impetigo
C: Infective endocarditis
Answer: C: Infective endocarditis 
Explanation: Blood culture is positive when bacteria present in blood, i.e. when there is bacteremia.
Infective endocarditis is a complication of staphylococcal aureus bacteremia (SAB). Thus blood culture may be positive.
Staphylococcal scalded skin syndrome (SSSS) and impetigo do not have bacteremia.
In toxic shock syndrome (TSS) due to staphylococcus aureus, bacteremia is uncommon (in contrast, bacteremia is common in streptococcal TSS).