Given a sentence and an entity, the task is to select the authors sentiment towards the enity. Sentiments can be Positive, Neutral and Negative. Select Positive if the sentence expresses a positive view towards the given entity or praises its quality or skills. Select Neutral if the sentence expresses no clear view towards the entity or has equal amounts of positive and negative statements or expressing some fact/quote by someone else. Select Negative if the sentence expresses a negative view towards like harsh remarks, criticizing entities action/decision etc. Note that URLs in the text have been replaced with [Link].

[EX Q]: What is the sentiment of the following document towards the entity Alexander Kellner ? Pterosaurs ran the gamut from the gigantic  aircraftlike Quetzalcoatlus all the way down to animals about the size of a sparrow  such as Nemicolopterus. Some had the long  pointy snouts we typically associate with the flying reptiles. Others boasted wild and crazy crests  which may have been used to attract the opposite sex  as has been suggested with H. tianshanensis. And still other pterosaur species had short  squat skulls more like  that of a frog   Chiappe said. (Albeit  a very scary frog.)
[EX A]: Neutral

[EX Q]: What is the sentiment of the following document towards the entity Kim Jong Un ? The suggestion came in response to bellicose rhetoric exchanged between US President Donald Trump and  Jong Un .
[EX A]: Neutral

[EX Q]: What is the sentiment of the following document towards the entity Huang Guangyu ?  Huang  in his 40s  was named China's richest man in October 2008 with an estimated net worth of 6.3 billion dollars by the Hurun Report magazine.
[EX A]:
Positive