What was the cause of Mozart's death?

What was the cause of Mozart's death?
A、He drowned in the Danube River.
B、He died in poverty and obscurity.
C、He succumbed to rheumatic fever.
D、His exact cause of death is unknown, but he may have died from a severe illness.
【正确答案】：D
【题目解析】：His exact cause of death is unknown, but he may have died from a severe illness.