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: Unknown
Diagnostic test for group A streptococcal 
erythroderma is 
Select and explain. 
A. Bile solubility test, B. Catalase test, C. Optochin sensitivity, D. Bacitracin sensitivity
D: Bacitracin sensitivity
Answer: D: Bacitracin sensitivity 
Explanation: None