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
Demographic process includes 
Select and explain. 
A. Morbidity, B. Marriage, C. Family planning, D. Education
B: Marriage
Answer: B: Marriage 
Explanation: Demographic process work on

Marriage.
Fertility.
Mortality.
Migration.
Social mobility.