TASK DEFINITION: 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].
PROBLEM: 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.

SOLUTION: yes

PROBLEM: Verify if the sentiment of the following document towards the entity Tequila Isaacson is Positive . The WSP will reportedly review the way the case was handled and added they are grateful for  Isaacson ’s courageous effort to help the child.

SOLUTION: yes

PROBLEM: Verify if the sentiment of the following document towards the entity Medvedev is Positive .  The remarks appeared to reflect Medvedev's desire to take a higher profile on economic and domestic policy issues presently controlled by Prime Minister Vladimir Putin -- though Medvedev stopped short of an open challenge to his powerful predecessor and mentor.

SOLUTION:
yes