"We love you Alex!" Gaur wrote in his reply worth $ 1,995. In place of the word love, Gauri wrote a heart.
"That's very nice, thank you," Trebek said and choked. The "wrong" answer to the cost left Gauer $ 5.
"We all hurt him so much for him," Gauer tweeted. "When the final danger came up, I could try to puzzle him along, but I really just thought about Alex."
Gauer was glad he had to say "what everyone at the tournament thinks."
He partnered with the World Pancreatic Cancer Coalition to make a video last month encouraging people to wear purple in November and help spread the word about the disease and its symptoms on social media.
Pancreatic cancer is often deadly and goes undiagnosed until late.