Contingent questions refer to two interrelated questions, of which the answer to the second question must be based on the answer to the first question. According to the above definition, which of the following two questions is a contingency problem? ['Are you hungry now? Where are you going to eat?', 'which is your sign of the zodiac? How old are you?', 'Is the contract for buying a house signed? Did you go to the house?', 'Do you like small animals? Does your sister like small animals?']