premise: "When Will I See You Again" is a song released in 1974 by American soul group The Three Degrees, from their third album "The Three Degrees". The song was written and produced by Kenny Gamble and Leon Huff. Sheila Ferguson sang the lead, accompanied by Fayette Pinkney and Valerie Holiday.
hypothesis: When Will I See You Again was the most popular song of 1971.
reason: The song was not released until 1974, therefore the song could not be the most popular song of 1971. I think the system has a hard time making inferences based on dates.