A magnesium wire resists 2.5 Ω at ice point and 10 Ω at steam point, and the resistance of wire is 4 Ω the room temperature would be

A magnesium wire resists 2.5 Ω at ice point and 10 Ω at steam point,

1.	A magnesium wire resists 2.5 Ω at ice point and 10 Ω at steam point, and the resistance of wire is 4 Ω the room temperature would be
A.	10 °C
B.	20 °C
C.	50 °C
D.	25 °C
Answer» C. 50 °C