Conversation so far:
What was a major product endorsement of Ai's?
Ai has worked on four major Coca-Cola TV commercial campaigns.
Did Ai have any big moves in her career
Ai's most high-profile work for a TV drama was the theme song for 2006's primetime drama Team Medical Dragon.
Did Ai only do song work
In April 2011, Ai presented a music documentary.
Did Ai ever sing with anyone else
After moving to Def Jam, Ai increasingly began collaborating with musicians, especially Japanese hip-hop and rap artists.
Who else did Ai do a collabo with in music
Ai had collaborated with Mao Denda, and Soul'd Out rapper Diggy-Mo'.

Question: What did she endorse for?
Self-contained rewrite: What products did Ai endorse for?