A good answer might be:

The string that was an argument to the constructor.

Making an Exception

There are two constructors for Exception: 

Exception()

and 

Exception( String str )

The string supplied to the second form can later be extracted from the object using its getMessage() method. Usually a method should construct and throw an exception all in one statement: 

if ( some problem )
  throw new Exception("Informative Message" ) ;

QUESTION 13:

Since Exception is not a final class, can it be extended?