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 infective skin lesion of the leg culture was done which showed gram+ve cocci in chains which where hemolytic colonies. The test to confirm the organism is - 
Select and explain. 
A. Bile solubility, B. Optochin sensitivity, C. Bacitracin sensitivity, D. Catalase positive
C: Bacitracin sensitivity
Answer: C: Bacitracin sensitivity 
Explanation: None