Does a struct pointer always point to the struct's 1st member?

Just a simple question.

Is it guaranteed that the pointer to a structure always points to the structure's first member?

e.g.

Code:

---

struct {
    data_type a;
    data_type b;
    ...
} my_struct;

---

Is it always true that &my_struct == &(my_struct.a) ?

Yes it does.

The value may be correct, but the type will always be wrong.