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: Has any of the teams Leadbitter rode for between 1966 and 1968 won a championship? Passage:Born in Lichfield, Staffordshire, Leadbitter was a successful grasstrack racer before taking up speedway in 1966 at the training school at Long Eaton. After a single match for Glasgow Tigers in 1966 he rode in four matches for Long Eaton Archers in 1967. In 1968 he was signed by newly formed Leicester Lions, but only made one appearance for the team that season, spending most of it on loan to Middlesbrough Teessiders. In 1969 he progressed with Middlesbrough, averaging close to nine points per match, and had rode in four matches in the top division as a guest for Newcastle Diamonds. In 1970 he stayed with Middlesbrough as well as riding in several matches for his parent club Leicester, and was recalled to a full team place for the Lions in 1971. He competed in the Second Division Riders Championship in 1970, finishing in fifth place. At the end of the season he transferred to Wolverhampton Wolves where he spent four seasons, establishing himself as a solid scorer, although in 1975 his rides for Wolves were limited and he returned to Teesside in the National League where he averaged over nine points and recorded five full maximum and three paid maximum scores in 33 matches. After a second season back with Teesside in 1976 he moved on to Bristol Bulldogs in 1977, his final season before retiring.

Output:
a