What insect is the adult form of a caterpillar in the family Papilionidae?

The adult form of a caterpillar in the butterfly family Papilionidae is a swallowtail butterfly.

Swallowtails are large, often vividly colored butterflies named for the tail-like extensions found on the hindwings of many species. Papilionidae contains more than 550 species and occurs on every continent except Antarctica. The family includes the birdwings, among the largest butterflies in the world.

Papilionid caterpillars have a distinctive defense organ called an osmeterium. Normally hidden behind the head, it can be suddenly everted when the larva is threatened, releasing chemicals that may deter predators. Many species feed on plants in the citrus family, Apiaceae, or other chemically defended groups.

“Caterpillar” describes the larval stage, not a separate kind of insect. After feeding and growing, the larva pupates, then emerges as the adult butterfly. The other options are different butterflies or moths: the painted lady and cabbage white belong to other butterfly families, while tiger moths are moths.