Hierarchical abstraction in c++

Question

I have following abstraction in my code:

class A{};

class B: public A{};

class C: public B{};

Now when I declare an instance of class C every thing is OK. The problem is when I declare class C in a function (with new) an return it as a pointer. I don't get any error but it seems that the object doesn't carry the characteristics of class A. Is it possible to do this in a function?