Wrong answer

I especially liked the reporting on the exams with erroneous questions.  Many arrogant reporters and commentators all smugly criticising the exam writers.  One of the exams, a biology multichoice was reported as having 'all the wrong answers'.  I doubt it.  Not ALL the wrong answers.  Obviously they meant that it did not have the right answer.  I doubt they had the answer 'Only Fools and Horses' for example although clearly that should be included in the set of wrong answers.