Question: Extract the answer to the following question from the movie plot. If the question isn't answerable, please output "Can't answer". Question: Who rebuffs Jack's advances? Title: Titanic Movie plot: In 1996, treasure hunter Brock Lovett and his team aboard the research vessel Keldysh search the wreck of RMS Titanic for a necklace with a rare diamond, the Heart of the Ocean. They recover a safe containing a drawing of a young woman wearing only the necklace. It is dated April 14, 1912, the day the ship struck the iceberg. Rose Dawson Calvert, claiming to be the person in the drawing, visits Lovett and tells of her experiences aboard the ship. In 1912 Southampton, 17-year-old first-class passenger Rose DeWitt Bukater, her fiance Cal Hockley, and her mother Ruth board the Titanic. Ruth emphasizes that Rose's marriage will resolve the DeWitt Bukaters' financial problems. Distraught over the engagement, Rose considers committing suicide by jumping from the stern; Jack Dawson, a penniless artist, convinces her not to. Discovered with Jack, Rose tells Cal that she was peering over the edge and Jack saved her from falling. Cal is indifferent, but when Rose indicates some recognition is due, he offers Jack a small amount of money. After Rose asks whether saving her life meant so little, he invites Jack to dine with them in first class the following night. Jack and Rose develop a tentative friendship, though Cal and Ruth are wary of him. Following dinner, Rose secretly joins Jack at a party in third class. Aware of Cal and Ruth's disapproval, Rose rebuffs Jack's advances, but later realizes that she prefers him over Cal. After rendezvousing on the bow at sunset, Rose takes Jack to her state room and displays Cal's engagement present: the Heart of the Ocean. At her request, Jack sketches Rose posing nude wearing it. They evade Cal's bodyguard and have sex in an automobile inside the cargo hold. They later visit the forward deck, witnessing a collision with an iceberg and overhearing the officers and designer discussing its seriousness. Cal discovers Jack's sketch of Rose and a mocking note from her in his safe along with the necklace. When Jack and Rose attempt to tell Cal of the collision, he has his butler slip...
Answer:
Can't answer