This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Health education & planning, Subject name: Social & Preventive Medicine
[{'content': 'In the critical path method, illness is the maximum if the causal factors affect a paicular period of life. The vulnerable period is - \nSelect and explain. \nA. Shoest, B. Longest, C. Cheapest, D. Costliest', 'role': 'user'}, {'content': "Answer: B \nExplanation: -Critical path method : the longest path of the network. - if any activity along the critical path is delayed, the whole project will be delayed. Reference : Park's textbook of preventive and social medicine, 23rd edition, pg no:872 <\\p>", 'role': 'assistant'}]