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
MDPI  does not include 
Select and explain. 
A. Health, B. Per capita income, C. Education, D. Standard of living
B: Per capita income
Answer: B: Per capita income 
Explanation: MDPI includes

Health.
Education.
Standerd of living.