A giant planet is any massive planet. They are usually primarily composed of low-boiling-point materials (gases or ices), rather than rock or other solid matter, but massive solid planets can also exist. There are four known giant planets in the Solar System: Jupiter, Saturn, Uranus and Neptune. Many extrasolar giant planets have been identified orbiting other stars.

Can we draw the following conclusion?
There are only four giant planets

Possible answers:
(A). Yes
(B). It's impossible to say
(C). No
(C).