Final answer:
True, the captain is responsible for opening and serving bottled wine when a sommelier is not available, as they usually manage restaurant service including wine service.
Step-by-step explanation:
The statement that the captain is responsible for opening and serving all bottled wine unless a sommelier is performing the service is generally true, particularly in fine dining establishments. The sommelier's role is to specialize in all aspects of wine service, including selection, opening, decanting, and serving. However, when a sommelier is not available, these responsibilities typically fall to the captain, or sometimes called the head waiter, who oversees service in a restaurant.