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
To notify a slide as AFB negative minimum how many fields should be checked? ? 
Select and explain. 
A. 20, B. 100, C. 50, D. 200
B: 100
Answer: B: 100 
Explanation: Ans. is `b' i.e., 100