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: Surgery
'Sterile needle test' helps in differentiating ? 
Select and explain. 
A. Healing proces, B. Depth of burns, C. Degenerative process, D. Infection
B: Depth of burns
Answer: B: Depth of burns 
Explanation: Ans. is 'b' i.e., Depth of burns