[Q]: Sentence: The isotopes 65Zn, 71Zn, 77Zn and 78Zn each have only one excited state. Question: How many radioisotopes of zinc have been discovered? OPTIONS:
- yes
- no
++++++++++
[A]: no

[Q]: Sentence: Selection of an electrification system is based on economics of energy supply, maintenance, and capital cost compared to the revenue obtained for freight and passenger traffic. Question: How do some locomotives function in order to be more flexible in operation? OPTIONS:
- yes
- no
++++++++++
[A]: no

[Q]: Sentence: A web browser (commonly referred to as a browser) is a software application for retrieving, presenting, and traversing information resources on the World Wide Web. Question: What does URL mean? OPTIONS:
- yes
- no
++++++++++
[A]:
no