Task: Text Categorization
Input (English): This work took over eight years to sell 600 copies. It contains a famous section relating a scene in a large hall with numerous guests, including the widow Irma and the author's friend Otto. It divides the title concept into its actual, or "manifest content," and its hidden meaning, or "latent content. "  This work contains chapters that attempt to identify the title concept's "Stimuli and Sources," its role as "Wish-Fulfillment," and to explain why they are forgotten upon waking. FTP, identify this work of Sigmund Freud that first analyzed the importance of understanding dreams.
Output (English): Social Science