question:
Until 1968, visible and infrared LEDs were extremely costly, in the order of US$200 per unit, and so had little practical use.
What modern company introduced LEDs in 1968?

answer: no

question:
In some places, however, such as in rural areas of Poland, dog fat is believed to have medicinal propertiesbeing good for the lungs for instance.
Dog fat in some parts of Poland is thought to have what?

answer: yes

question:
The city of Rome had a place called the Campus Martius ("Field of Mars"), which was a sort of drill ground for Roman soldiers.
What was Roman version of Chess called?

answer: no

question:
After African leaders in Chad refused to recognize Djotodia as President, proposing to form a transitional council and the holding of new elections, Djotodia signed a decree on 6 April for the formation of a council that would act as a transitional parliament.
Who would rule the country temporarily?

answer:
yes