Instructions: In this task, you're given a question, along with a context passage. The passage will not have a direct answer to the question, but can include some information and a clue for the answer. Assuming you can only obtain information about one entity in the passage, your job is to determine whether information from the passage can be used to answer the question. Indicate your choice as 'a' for Yes or 'b' for No.
Input: Question: Who played Stephen Amell's character's son? Passage:The series follows billionaire playboy Oliver Queen (Stephen Amell), who claimed to have spent five years shipwrecked on Lian Yu, a mysterious island in the North China Sea, before returning home to Starling City (later renamed "Star City") to fight crime and corruption as a secret vigilante whose weapon of choice is a bow and arrow. In the sixth season, after an explosive battle on Lian Yu, Oliver must balance being a vigilante, the mayor, and a father to his son, William. At the same time, new enemies emerge, initially led by terrorist hacker Cayden James (Michael Emerson), who allies himself with various criminals including drug dealer Ricardo Diaz (Kirk Acevedo), metahuman vigilante Vincent Sobel (portrayed by Johann Urb, voiced by Mick Wingert when masked), Russian mobster Anatoly Knyazev (David Nykl), and metahuman Black Siren. As James loses control of his cabal, Ricardo Diaz comes to the fore and kills him, revealing that he manipulated James into believing Oliver killed his son, and announcing to Green Arrow his scheme to take over Star City's criminal underworld and control the city's political infrastructure, all while Oliver must contend with his former teammates forming a rival team. As Diaz takes control of the city, Oliver is forced to recruit the aid of the FBI, in exchange for him publicly announcing his identity and going to federal prison. In the finale, Oliver is imprisoned in a maximum security penitentiary.

Output:
b