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
Which one of the following is not source of manager's power - 
Select and explain. 
A. Reward, B. Coercive, C. Legitimate, D. Efferent
D: Efferent
Answer: D: Efferent 
Explanation: Ans. is 'd' i.e., Efferent