'We have prepared a little test for you,' says Aunty, changing the subject, 'Should you be successful, we will provide you with everything you need to complete your mission.'

'But should you fail,' says Uncle 'the penalty will be severe.' He proceeds to ask you the following riddle... 'What is head, and looks like a bankie?' What answer will you give?

a) A porcupine;
b) Treemash;
c) 37.5;
d) Don't know