Reveal or Hide the Salarian Duchess’ Deal – Mass Effect 3
The Krogan genophage was created by the Salarians to cull the Krogan population explosion. To secure the Krogan’s help against the Reapers, they ask Shepard to help them cure the genophage. Shepherd obliges, but before leaving to disperse it, he is informed by the Salarian Duchess that there is a way to trick the Krogan into thinking the genophage was cured without actually doing so.
The player is then faced with a multitude of different possible options: save the Krogan and tell the truth, save them and lie, or condemn them and lie. There’s no inherent benefit to telling the truth. In fact, it could potentially flare up a disastrous conflict between the Krogans and Salarians. After all, the Krogans are hardly known for their diplomatic prowess. The choice essentially boils down to whether the player thinks the Krogan deserve saving, and whether they are mature enough to not go to war after finding out that they almost faced a second artificially created genophage.