Both the winged Pegasus and the giant or winged boar Chrysaor could be called sons of Medusa because they emerged when her head was cut off by Perseus.
Medusa had two offspring, Pegasus and Chrysaor.
Deuce gorgon
zytan
Perseus.
I'm going to assume that you're asking which son of Zeus killed Medusa, in which case the answer would be Perseus.
Zyzz Shaversarian
Some say that Pegasus jumped out of Medusa's blood after her head was cut off. In these versions, Pegasus was said to be the son of Medusa and Poseidon.
No, he did not. The hero Perseus killed Medusa. Perseus was also Zeus' son but his mom was mortal.
Perseus, son of Zeus, killed Medusa because she turned people to stone -- essentially, because she was a murderer.
In some versions of the myths, yes, he's the son of Poseidon and Medusa. What I read is that he 'sprung' from the body of Medusa after she was slain by Perseus, the son of Zeus. Medusa used to be a beautiful maiden. Poseidon and Medusa were found together in the temple of Athena by Athena. Athena found that deeply disrespectful, and since she could not punish her uncle, she settled for turning his new girlfriend into a hideous monster.
The individual you are referring to is Perseus, a hero in Greek mythology known for slaying Medusa and for being the son of Zeus and Danaë. After defeating Medusa, he used her head as a weapon, including turning the sea monster Cetus to stone to save Princess Andromeda.
Pegasus is not commonly known as Medusa's symbol. Pegasus is supposedly Medusa's son by Poseidon but couldn't be born until Medusa died because of her changed appearance. When speaking of Medusa, people most commonly think of snakes because of her hair.