This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Immunology, Subject name: Microbiology
Superantigen is produced by 
Select and explain. 
A. Staphylococcus aureus, B. Streptococcus pneumoniae, C. Pseudomonas aeruginosa, D. Clostridium diphtheriae
A: Staphylococcus aureus
Answer: A: Staphylococcus aureus 
Explanation: Superantigens are that antigen which can generate the high immune response upon introduction