Given a sentence, an entity and its sentiment towards the entity, verify if it is the correct sentiment towards the entity. Answer should be yes or no. Note that URLs in the text have been replaced with [Link].

Verify if the sentiment of the following document towards the entity Ken Brown is Negative .  Brown  leaves for Tanzania on Thursday  and the group will begin their climb on Sunday. If all goes as planned  it should take six days to reach the summit.  Brown  says  he âs not concerned about whether or not  he  will make it to the top  as  he  said  he  believes  he âs already hiked the tallest mountain anyone can with Dr. Bilimoria.
no

Verify if the sentiment of the following document towards the entity Lance Armstrong is Positive .  In May  Armstrong's former teammate Floyd Landis shocked the cycling world by publicly accusing Armstrong and other team members of using performance-enhancing drugs and blood transfusions to gain an unfair advantage. Landis said that Armstrong -- the biggest name in the sport -- had encouraged the doping and that the team had sold its bikes to help finance an expensive doping program.
yes

Verify if the sentiment of the following document towards the entity Walter Shaub is Positive .  Shaub  told Browder that the conversation brought another Bill to mind:

no