Final answer:
The statement is false; in the CPT index, the main terms are not typically italicized but rather presented in bold. The use of italics and bold italics varies in educational texts based on the importance of the terms.
Step-by-step explanation:
The statement that main terms appear in italics in the CPT index is false. In the CPT (Current Procedural Terminology) manual, the main terms are not typically italicized. Instead, key terms within the CPT manual are usually presented in bold and are sometimes followed by their definitions in the context of the manual's use. Furthermore, in educational texts, different formatting styles such as bold italics and italics are often used to denote the importance of a term or concept, with bold italics being used to highlight the highest level of importance, often accompanied by hyperlinks for further exploration.