using System;

public class Program

{

    public static void Main()

    {

        var instance = GetInstance<man>();

        instance.Say();

    }

    public static person GetInstance<T>() where T:person,new(){

        return new T();

    }

​

}

​

​

​

public class women:person{

    public void Say(){Console.Write("I am women");}

}

​

public class man:person{

    public void Say(){Console.Write("I am man");}

}

​

public class child:person{

    public void Say(){Console.Write("I am child");}

}

​

public interface person{

    void Say();

}

​