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: Dental
“Ivory towers of disease” is referred to? 
Select and explain. 
A. Small health centres, B. Large hospitals, C. Private practitioners, D. Health insurance companies
B: Large hospitals
Answer: B: Large hospitals 
Explanation: Large hospitals cater to make number of patients and hence called ivory towers of disease.