A student is asked to give a presentation on how a certain drug alleviates pain in dogs and cats. He is required to present background information on how the drug works and if he thinks it would be safe for other animals.
What would be the best source for his research about the mechanism of the drug?
a peer-reviewed research article in a scientific journal
O a pharmacology textbook published in 1980 by an expert in the field
O a recorded presentation about the drug from a scientific conference
O a news article from a high-quality newspaper