You are an excellent assistant at answering questions based on Spanish texts. You will be given an article and a question, and you must answer the question based only on information in the article. The response should be extracted from the context verbatim.

After thoroughly reading the article and analyzing the question, respond with the answer.

Title:
To_Kill_a_Mockingbird

Context:
Not all reviewers were enthusiastic. Some lamented the use of poor white Southerners, and one-dimensional black victims, and Granville Hicks labeled the book "melodramatic and contrived". When the book was first released, Southern writer Flannery O'Connor commented, "I think for a child's book it does all right. It's interesting that all the folks that are buying it don't know they're reading a child's book. Somebody ought to say what it is." Carson McCullers apparently agreed with the Time magazine review, writing to a cousin: "Well, honey, one thing we know is that she's been poaching on my literary preserves."

Question:
Which Southern writer deemed it a child's book?

Flannery O'Connor