Answer:
When two object pronouns beginning with the letter l (le, les, la, lo, las, los) are used, the first pronoun, the IOP, changes to "se". For example, "Mayté le dio comida al perro," changed to IOP, will be "Mayté se la dio."
Step-by-step explanation:
The question is, in fact, very general. It should be more specific, or probably your teacher talked about it before and thought you remember. The only "irregular" situation with double object pronouns I can tell will be the one I previously provided, but I'm not sure the answer is correct, though.
Wish you the best!