Problem: Does "A series of experiments performed from the late 1800s to the early 1900s revealed that diabetes is caused by the absence of a substance normally produced by the pancreas." answer the question "What is diabetes caused from?"

A: yes

Problem: Does "The latter was able to use this tax and a dynastic marriage to his advantage to gain back full control of Upper Alsace (apart from the free towns, but including Belfort) in 1477 when it became part of the demesne of the Habsburg family, who were also rulers of the empire." answer the question "In what year was Upper Alsace sold to the Archduke Sigismund?"

A: no

Problem: Does "It is said that Vladimir Lenin and a young Joseph Stalin met in the Crown and Anchor pub (now known as The Crown Tavern) on Clerkenwell Green when the latter was visiting London in 1903." answer the question "In what year did Joseph Stalin visit London?"

A:
yes