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
All are examples of Independent variables except: 
Select and explain. 
A. Cause, B. Predisposing factors, C. Risk factor, D. Outcome
D: Outcome
Answer: D: Outcome 
Explanation: Variables:
Independent variable

Eg: Cause, predisposing factor, risk factor
Can be manipulated

Dependent variable

Eg: Outcome, result, effect
Cannot be controlled or manipulated