QUESTION: Generate a question with a factual answer?

ANS: What may not be adopted?

QUESTION: Generate a question with a factual answer?

ANS: What is the inflamation a result of?

QUESTION: Generate a question with a factual answer?

ANS: Why the commuter lines built to different standards can cause be complicated?

QUESTION: Generate a question with a factual answer?

ANS:
In what decade did fiber-optics become widely used?