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.

Example Input: Question: What is the maximum length of the species that is known to prey on the crossback stingaree? Passage:The broadnose sevengill shark (Notorynchus cepedianus) is known to prey on the crossback stingaree. When threatened, this ray raises its tail warningly above its body in a scorpion-like fashion. Parasites documented from this species include a tapeworm in the genus Acanthobothrium, and the monogenean Calicotyle urolophi. Like other stingrays, the crossback stingaree is aplacental viviparous: when the developing embryos exhaust their supply of yolk, their mother provisions them with nutrient-rich histotroph ("uterine milk") through specialized extensions of the uterine epithelium called "trophonemata". Females produce litters of 1–4 pups every other year. Embryonic development proceeds rapidly over a six-month period, though the total gestation period may be much longer if there is a period of dormancy for the eggs after fertilization, as has been reported in other stingarees. Off Tasmania, large estuaries such as at the mouth of the River Derwent serve as nursery areas.

Example Output: b

Example Input: Question: What present day country was Pontus? Passage:According to the Georgian chronicles, Nana was "from a Greek territory, from Pontus, the daughter of Oligotos" whom Mirian married after his first wife died (in 292 according to Cyril Toumanoff). Nana bore Mirian two sons: Rev II, Varaz-Bakur and a daughter who married Peroz, the first Mihranid dynast of Gugark. Pontus here may refer to the Bosporan Kingdom, then a client state of the Roman Empire. Toumanoff has assumed that the name of Nana's father might have been a Georgian corruption of "Olympius" or "Olympus", a Bosporan dynast whose son Aurelius Valerius Sogus Olympianus, a Roman governor of Theodosia, is known from a Greek inscription of 306 dedicated to "the Most High God" on the occasion of the building of the Jewish "prayer house". Alternatively, Christian Settipani identifies Nana as a younger daughter of Theothorses, a Bosporan king.

Example Output: a

Example Input: Question: At what age did Craig Fairbrass first appear on EastEnders? Passage:Dan Sullivan is a fictional character from the BBC soap opera EastEnders, played by Craig Fairbrass. Dan appeared on the show as a regular from 7 June 1999 to 10 July 2000 before returning as one of the show's primary antagonists from 26 February to 16 August 2001. He became central to a storyline involving a love triangle between himself, his lover Carol Jackson (Lindsey Coulson), and her daughter Bianca (Patsy Palmer) — whom Dan embarks on an affair with. Soon afterwards, the character developed an intense feud with local hardman Phil Mitchell (Steve McFadden); the pair started out as best-friends, but ended up becoming archenemies after Phil conned Dan's ownership of The Queen Victoria public house. During the course of their escalating rivalry, Dan become a prime suspect in Phil's shooting after the latter gets shot on the night their ex-lover Mel Healy (Tamzin Outhwaite) married Dan and Phil's fellow nemesis Steve Owen (Martin Kemp). Although Mel's best-friend and Phil's ex-girlfriend Lisa Shaw (Lucy Benjamin) was revealed to be the shooter, Phil ended up framing Dan for the crime - which leads to Dan being wrongfully imprisoned prior to his trial in mid-summer 2001; the trial culminated with Dan being found not guilty, and the character then departed the show after kidnapping Mel and holding her ransom to get revenge on Phil and Steve for conspiring to get him sent down.

Example Output:
b