单选题 有如下函数过程：
Function Fun(By Val x As Integer,ByVal y As Integer)As Integer
Do While y＜＞0
reminder=x Mod y
x=y
y=reminder
Loop
Fun=x
End Function
以下调用函数的事件过程，该程序的运行结果是
Private Sub Command7_Click()
Dim a As Integer,b As Integer
a=100:b=25
x=Fun(a,b)
Print x
End Sub