Who's on First, What's on __

This page is the CodyCross answer for the clue below from Art Museum, Group 730, Puzzle 4 (Charitable Donations).

Question

Who's on First, What's on __

Answer

SECOND

Word Meaning:

SECOND — Number-two; following after the first one with nothing between them. The ordinal number corresponding to the cardinal number two.

Definitions from Wiktionary.

Who's on First, What's on __ Art Museum Answers