Final answer:
The truthfulness of the statement depends on the specific policy of an establishment regarding napkin distribution. Some may provide napkins only upon request, while others allow free access.
Step-by-step explanation:
The statement 'Extra napkins are given by request only' can be considered true or false depending on the policy of the specific establishment you are referring to. In some restaurants or food service businesses, extra napkins may be provided only when a customer requests them, as part of an effort to reduce waste and control costs. In other cases, businesses might leave a stack of napkins accessible for customers to take as needed without having to ask. Hence, without context, it is not possible to definitively answer this as true or false.