This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Bacteria, Subject name: Microbiology
Type of growth of streptococcus pyogenes on blood agar - 
Select and explain. 
A. Alpha hemolytic, B. Beta hemolytic, C. Gamma hemolytic, D. Non-hemolytic
B: Beta hemolytic
Answer: B: Beta hemolytic 
Explanation: Ans. is 'b' i.e., Beta hemolytic Hemolysis | |||Alpha (a)Beta (b)Gamma (g)* Greenish discolouration with partial hemolysis around the colonieseg - Str. pneumoniae, Str. viridans* Colourless zone of complete hemolysiseg - Str. pyogenes (grp A)Str. agalactiae (grp B)Str equisimilis (grp c)* No hemolysiseg - Enterococci (grp d)