Question:  Catriona Millar's first solo exhibition at the Dundas Street Gallery caught the attention of the co-founder of what ad agency?
Sentence (from "Charles Saatchi"): Charles Saatchi ( ; Arabic: تشارلز ساعتجي‎ ‎ ; born 9 June 1943) is an Iraqi-British businessman and the co-founder with his brother Maurice of advertising agency Saatchi & Saatchi.
Relevant evidence: Yes