What it teaches
The five senses and which one applies. It is the first time a child is asked to think about how they know something rather than about what they know, and that is a genuinely new kind of question at five or six.
What to look for
The cases with two answers are worth arguing over. A fire can be seen and felt; bread can be smelled and tasted. The game takes the strongest one, and a child who objects has understood more than one who agrees.