Does the sentence "The cells in the blood vessel walls are joined tightly to one another, forming the bloodbrain barrier, which blocks the passage of many toxins and pathogens (though at the same time blocking antibodies and some drugs, thereby presenting special challenges in treatment of diseases of the brain)." provide a valid answer to the question "The blood-brain barrier is made up of what?" OPTIONS:
- yes
- no

A: yes

Does the sentence "There is an elevation difference of several metres between the inner city districts on the Aare (Matte, Marzili) and the higher ones (Kirchenfeld, Langgasse)." provide a valid answer to the question "What is the elevation difference between the inner cities and the other cities?" OPTIONS:
- yes
- no

A: yes

Does the sentence "Rather than providing a final solution to the question of how to best measure sexual orientation, the SASO is meant to provoke discussion and debate about measurements of sexual orientation." provide a valid answer to the question "What did SASO find wrong with the KInsey scale and Klein Sexual Orientation Grid?" OPTIONS:
- yes
- no

A: no

Does the sentence "The Socialists had governed the region for seventeen years." provide a valid answer to the question "For how many years did the socialists governed the region?" OPTIONS:
- yes
- no

A:
yes