Choose from:
(I) oxgen
(II) influenza
(III) viruses
(IV) disease
(V) chickenpox
(VI) bacteria
(VII) cooking food
(VIII) contracting itchiness
Given those answer options, answer the question: You are presented with the quiz "what causes serious illness?" But you don't know the answer, so you turn to your teacher to ask for hints. He says that "bacteria cause food poisoning" and "food poisoning is a serious illness". So, what's the best answer to the question?
A:
(VI)