The first compound which reacts with water when mixed with cement is
(a) Tricalcium Aluminate
(b) Tricalcium silicate
(c) Di-calcium silicate
(d) Teracalcium aluminate
(a) Tricalcium Aluminate
(b) Tricalcium silicate
(c) Di-calcium silicate
(d) Teracalcium aluminate