Which of these astrological signs is not a water sign?

The three water signs are: Cancer, Pisces and Scorpio.

In Western astrology, astrological signs are the twelve 30° sectors of the ecliptic, starting at the vernal equinox (one of the intersections of the ecliptic with the celestial equator), also known as the First Point of Aries. The order of the astrological signs is Aries, Taurus, Gemini, Cancer, Leo, Virgo, Libra, Scorpio, Sagittarius, Capricorn, Aquarius and Pisces.

Each sign is associated with one of the classical elements, and these can also be grouped according to polarity: Fire and Air signs are considered positive or extrovert, masculine signs; while Water and Earth signs are considered negative or introvert, feminine signs. The four astrological elements are also considered as a direct equivalent to Hippocrates' personality types (sanguine = air; choleric = fire; melancholic = earth; phlegmatic = water).