Given a statement, generate a question such that the answer is contained in that statement.

Ex Input:
bone density decreases when osteoclasts are more active than osteoblasts

Ex Output:
What is more active than osteoblasts?


Ex Input:
scales protect trout from predators and parasites

Ex Output:
What do scales protect trout from?


Ex Input:
anesthetics block neuron transmissions

Ex Output:

What do anesthetics block?