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
All of the following involve a two-way communication except 
Select and explain. 
A. Symposium, B. Lecture, C. Panel discussion, D. Workshop
B: Lecture
Answer: B: Lecture 
Explanation: In network analysis

Shortest (minimum) time or path → PERT
Longest time or path → Critical path method