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
P.E.R.T. is a type of- 
Select and explain. 
A. Input output analysis, B. System analysis, C. Network analysis, D. Work sampling
C: Network analysis
Answer: C: Network analysis 
Explanation: Ans. is 'c' i.e., Network analysis