You are presented with the quiz "What determines the flavor of sweet foods like sugar?" But you don't know the answer, so you turn to your teacher to ask for hints. He says that "sugar causes food to taste sweet" and "for example, the tongue determines the taste of foods, deciding whether a thing is sweet or bitter". So, what's the best answer to the question?

Choices: (i) Enzymes (ii) ingredients (iii) hormones (iv) profile (v) sugar (vi) tongue (vii) dentist (viii) Glucose
The answer is:
(vi)