Which one of the following is the largest satellite in solar system ?

Ganymede is the largest natural satellite in the solar system, with a diameter of approximately 5,268 km [1]. It is one of the four Galilean moons of Jupiter and is notably larger than the planet Mercury [3]. Titan, which orbits Saturn, is the second-largest moon in the solar system, measuring about 5,150 km in diameter [2]. While Titan is the only moon with a substantial nitrogen-rich atmosphere, Ganymede remains the largest by volume, exceeding Titan's diameter by roughly 2 percent [1][t1]. Other significant moons like Callisto, Io, and Earth's Moon are smaller than both Ganymede and Titan [1][t7]. Triton, the largest moon of Neptune, and Europa, another Galilean moon, are also significantly smaller than Ganymede [t4][t7]. Therefore, Ganymede holds the record for the largest moon in our solar system.

Sources

1. [1] Physical Geography by PMF IAS, Manjunath Thamminidi, PMF IAS (1st ed.) > Chapter 2: The Solar System > Jupiter > p. 31
2. [3] Physical Geography by PMF IAS, Manjunath Thamminidi, PMF IAS (1st ed.) > Chapter 2: The Solar System > Mercury > p. 27
3. [2] Physical Geography by PMF IAS, Manjunath Thamminidi, PMF IAS (1st ed.) > Chapter 2: The Solar System > Saturn > p. 32