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
A child presents with sepsis. Bacteria isolated showed beta hemolysis on blood agar, resistance to bacitracin, and a positive CAMP test. The most probable organism causing infection is - 
Select and explain. 
A. S. Pyogenes, B. S. Agalacitae, C. Enterococcus, D. S. Pneumoniae
B: S. Agalacitae
Answer: B: S. Agalacitae 
Explanation: Points favoring to S. agalactiae:

Septicemia in a child
β hemolysis on blood agar
Resistant to bacitracin and a positive CAMP test

S. pyogenes: sensitive to bacitracin and CAMP test is negative.
Ref: Apurba Sastry’s Essentials of Medical Microbiology 1/e p229, Ananthanarayan 9/e p216, 8/e p207