Answer:
Relative pronoun: who
Antecedent: an artist
Explanation:
Relative pronouns replace a subject pronoun or noun. In this case, the relative pronoun who is used to replace the noun phrase an artist, which is the subject of the following clause.
Besides, who is used to refer to people; while other relative pronouns like which, when and why are used to replace things, periods of time and reasons, respectively.
