Instruct: Classify Amazon reviews into positive or negative sentiment
Query: A very good reference for the sources of Catholic dogma.

Every Catholic apologist needs to have this book on their shelf for reference. It covers the breadth of Catholic dogma well. Explanations are concise but what they lack in depth is made up with abundant references. Most questions can be answered with the content contained in the book. When more information is desired, the references are good starting points for exploring the more subtle aspects of a particular dogma.