The question is asking for an example of perpendicular lines from the given choices.
Perpendicular lines are two lines that intersect at a right angle (90 degrees). In order to identify perpendicular lines, we would typically compare the slopes of two lines; if the slopes multiply to equal -1, then the lines are perpendicular.
But in the given options 1) OA 2) X1 3) B. 4) C. 5) D., we cannot determine any pairs of lines or any slopes. These options appear to be standalone points or line identifiers rather than pairs of lines or equations. It's not possible to check if any of these points or line identifiers represent perpendicular lines without having more context or information.
Given the context that we currently have, we are unable to provide a complete solution to this question. This isn't something that can be solved with computation or formulaic methods; we need more information. The answer to the question in its current state is that it's unanswerable because it does not provide enough information for us to determine which lines could potentially be perpendicular.
So, the appropriate response to this question is to clarify what the options 'OA', 'X1', 'B', 'C', and 'D' represent. We might also request that the question be rephrased to directly refer to pairs of lines or the equations of lines, as that's the typical way to resolve a question about perpendicular lines.