Given the task definition and input, reply with output. Generate a question which can yield the answer mentioned in the input. Generated question must be answered by the answer provided in input, without using any extra knowledge.

Context : Dr. John Croghan (April 23, 1790 -- January 11, 1849) was an American medical doctor who helped establish Louisville Marine Hospital and organized some tuberculosis medical experiments and tours for Mammoth Cave, in Kentucky (U.S.) during 1839-1849.
Answer : tuberculosis
What medical condition killed John Croghan?