This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Lab Investigations, Subject name: Microbiology
Catalase positive, coagulase negative beta hemolytic bacteria 
Select and explain. 
A. Strep pyogens, B. Staph aureus, C. CONS, D. Enterococci
C: CONS
Answer: C: CONS 
Explanation: All staphylococci are catalase positive. Amongst staphylococci, Staph. aureus and Staph haemolyticus (CONS) are beta hemolytic. Most species of coagulase negative staphylococcus species are non-hemolytic except Staph. haemolyticus.