Which Question Would Be the Best Example of a Knowledge-Focused

Which question would be the best example of a knowledge-focused trigger for conducting an evidence-based practice project?

A) What is the best method for treatment of leg swelling when a patient is taking gabapentin (Neurontin) ?
B) How can we decrease the incidence of skin cancer in adults over the age of 65?
C) What is the current evidence for improving oral intake for cancer patients with stomatitis?
D) What is the maximal length of time our hospital allows irrigation kits to be used?