A rhetorical question was a type of question intended to make a point rather then be answered.
In 2270, James T. Kirk asked Spock, "How come we always end up like this?" (held captive, in this case by the Delta Theta III aborigines). Spock replied with his assumption that Kirk's question was rhetorical. When Kirk expanded on his question, Spock suggested fate might be the answer. (TAS: "Bem")