There is flexibility in which of <hint>, <answer>, and <solution> can be included or excluded in your text, which can be included or excluded in an Instructor's Version, and which can be included or excluded in a Solution Manual (see Section 35.1). You can choose to author these or not, and then decide which to include in the student version, and which to include in an independently-produced Instructor Version, and which to include in a Solution Manual.