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: Manager's power : 1) Position power - Legitimate 2) Formal power a. Reward b. Coercive 3) Personal power a. Expe b. Referent Efferent power is not coming in Manager's power. Ref: Introduction to Educational Administration : Standards, Theories, and Practice By Douglas J. Fiore, 2004, Page 11