Jojo agrees to buy a small Picasso painting from Tamara for $500,000. Just prior to that,Tamarahired a reputable appraiser for a current valuation of the painting and showed Jojo the appraisal document that justified that $500,000 sales price. Satisfied, Jojo makes the $500,000 payment and takes his prized painting home. Shortly thereafter, he does some investigating, and learns that the painting was not done by Pablo Picasso. Instead, it was drawn by Paulo Picasso, Pablo's son, and was worth only $5,000. Jojo, now furious, wants to rescind the contract and get his money back from Tamara.

Among Jojo's possible arguments to get the contract rescinded, which one isbest? Please explain your answer and rationale for choosing.