Option 1: Titan - Titan is the largest moon or satellite of the planet Saturn. It is the second-largest moon in our solar system. While it is a significant moon, it is not the largest satellite in the solar system.

Option 2: Ganymede - Ganymede is the largest moon or satellite in the solar system. It is one of Jupiter`s moons and is larger than the planet Mercury. With a diameter of about 5,268 kilometers, it surpasses all other moons and is officially recognized as the largest satellite in the solar system.

Option 3: Europa - Europa is another moon of Jupiter and is known for its potential to harbor a subsurface ocean. However, it is significantly smaller than Ganymede and therefore not the largest satellite in the solar system.

Option 4: Triton - Triton is Neptune`s largest moon. Although it is larger than Earth`s moon, it is still smaller than Ganymede, making it incorrect to say that Triton is the largest satellite in the solar system.

Thus, the correct answer is option 2: Ganymede. It holds the title of being the largest satellite in the solar system.