This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Bacteriology, Subject name: Microbiology
Which of the following organism is catalase positive, coagulase positive, non-motile, facultative anaerobe and do not form spores? 
Select and explain. 
A. Streptococcus viridians, B. Pneumococcus, C. Staphylococcus aureus, D. Pseudomonas aeruginosa
C: Staphylococcus aureus
Answer: C: Staphylococcus aureus 
Explanation: The staphylococci are gram-positive spherical cells, usually arranged in grapelike irregular clusters. They are nonmotile and do not form spores.The staphylococci produce catalase, which differentiates them from the streptococci. Staph.aureus is coagulase positive, which differentiates it from the other speciesReference: Jawetz, Melnick, & Adelberg's Medical Microbiology; 27th edition; Chapter 13; The Staphylococci