To solve this spatial aptitude question, we need to determine which pattern among P, Q, R, and S is used to generate the given figure.

The key to solving this question is to closely analyze the design and arrangement of each pattern option, focusing on distinct features such as line intersections, symmetry, and the overall configuration of the pattern.

Let's evaluate each option:

1. Pattern P: Observe the design; it contains more vertical and horizontal lines without creating a similar compact grid structure as the given figure.
2. Pattern Q: This pattern closely resembles the given figure. Both the pattern and the given figure exhibit a consistent grid-like configuration with repeating units, indicating that this design matches the original.
3. Pattern R: This pattern has distinct disconnected elements that do not align with the continuous pattern found in the given figure. It lacks the compactness and continuity.
4. Pattern S: Similar to pattern R, this does not have the compact grid structure to match the given figure. The elements are more dispersed and unaligned with the figure's layout.

Conclusion: Upon evaluating all the patterns, we determine that the pattern labelled Q is used to generate the given figure. The alignment, grid structure, and continuity of pattern Q make it the correct option.

Correct Answer: Q