The best response to answer the question in Spanish is:
Responses in Spanish.
Spanish, like many other languages, tends to use the shorter forms to answer informal questions that are often seen in everyday life.
In the case of the question "¿qué quieres comer?," you must choose a short noun that reflects a food that can be eaten, in this case, chocolate fulfills this function since it can be found to drink, as well as to eat in its bar presentation.
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