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: Social & Preventive Medicine
Safety officer is appointed in factories when no of  workers are 
Select and explain. 
A. > 500, B. > 1000, C. > 1500, D. > 2000
B: > 1000
Answer: B: > 1000 
Explanation: None