To whom does Q ask about the Walt Whitman poem, "Song of Myself" and what does he learn from the person?

Q is so desperate to find Margo that he decides to talk to Dr. Holden, his English teacher, about Margo's message in Walt Whitman's poem, "Song of Myself." Dr. Holden tells Q that the Whitman poem is an odd suicide note as it is optimistic, holding that life is sacred and valuable.