About Question enthuware.ocpjp.v8.2.1176 :

[Perelun]

The answers explanations seems to me ambiguous because the first
"public class ReconciliationException extends Throwable" is valid, because it compiles, also if it is not a good practice, as explained.

[admin]

The problem statement says "should" and not "can". That is why extending Throwable or Error are incorrect options as explained in the explanation.