Question: Who was Katherine married to? If there is no answer, please output "Insufficient information to provide an answer.". Movie title: Son of Dracula Context: Hungarian Count Alucard (Lon Chaney Jr.), a mysterious stranger, arrives in the U.S. invited by Katherine Caldwell (Louise Allbritton), one of the daughters of New Orleans plantation owner Colonel Caldwell (George Irving). Shortly after his arrival, the Colonel dies of apparent heart failure and leaves his wealth to his two daughters, with Claire receiving all the money and Katherine his estate "Dark Oaks." Katherine, a woman with a taste for the morbid, has been secretly dating Alucard and eventually marries him, shunning her long-time boyfriend Frank Stanley. Frank confronts the couple and tries to shoot Alucard, but the bullets pass through the Count's body and hit Katherine, seemingly killing her. A shocked Frank runs off to Dr. Brewster, who visits Dark Oaks and is welcomed by Alucard and a living Katherine. The couple instruct him that henceforth they will be devoting their days to scientific research and only welcome visitors at night. Frank goes on to the police and confesses to the murder of Katherine. Brewster tries to convince the Sheriff that he saw Katherine alive and that she would be away all day, but the Sheriff insists on searching Dark Oaks. He finds Katherine's dead body and has her transferred to the morgue. Dr. Brewster is shown reading the novel "Dracula". Meanwhile, Hungarian Professor Lazlo arrives at Brewster's house. Brewster has noticed that Alucard is Dracula spelled backwards and Lazlo suspects vampirism. A local boy brought to Brewster's house confirms this suspicionthere are bite marks on his neck. Later, the Count appears to Brewster and Lazlo but is driven away by a cross. Vampiric Katherine enters Frank's cell as a bat and starts his transformation. After he awakens, she tells him she still loves him. She explains that she only married Alucard (who is really Dracula himself) to obtain immortality and wants to share that immortality with Frank. He is initially repulsed by her idea, but then yields to her. After she explains that she has already drunk some of his blood, she...
Answer:
Alucard.