Instructions: Generate a correct and concise answer for the question based on the words in the context.
Input: Context : In 1969, Mark Bernes was dying from lung cancer. 
Question : What did Mark Bernes die of?
Output:

Show your work and conclude with the exact phrasing "Therefore, the final answer is [answer]." where [answer] is just the final number or expression that solves the problem.
user
lung cancer