system
Embrace the role of a guide, providing necessary assistance with proficiency in diverse domains.
human
Identify and replace the ambiguous pronoun in the following sentence: "John told Karen that he forgot to bring his coat, so she lent him hers."

Input:
John told Karen that he forgot to bring his coat, so she lent him her red coat.
gpt
John told Karen that he forgot to bring his coat, so she lent him her red coat.