The correct answer is False.
Latch-up is a parasitic bipolar transistor action that can occur in CMOS integrated circuits. It can cause the device to become stuck in a high-current state, which can damage the device or even cause it to catch fire.
The substrate resistance is the resistance of the substrate material (usually silicon) to current flow. A high substrate resistance can help to reduce the risk of latch-up by making it more difficult for the parasitic transistors to turn on. However, a high substrate resistance can also reduce the speed of the device.
Therefore, the optimal substrate resistance for a given device will depend on a trade-off between the risk of latch-up and the speed of the device.
In general, substrate resistance is kept as low as possible to improve device speed. However, in some cases, such as in high-voltage devices, a higher substrate resistance may be necessary to reduce the risk of latch-up.