instruction:
In this task, you're given a context, further information available on a particular linked term from the statement, and an answer term. Your job is to generate a question that can use the information provided to obtain the given answer. You should use the information on both context and link information to create the question. Note that the answer to the question should be exactly the given answer, and if the answer is none, the answer to the question shouldn't be obtainable from the context or linked information.
question:
Context: On 17 April 2010, the president of German airline Air Berlin, in an interview with the newspaper Bild am Sonntag, stated that the risks for flights due to this volcanic haze were nonexistent, because the assessment was based only on a computer simulation produced by the VAAC. Link Information: On 17 April 2010, the president of German airline Air Berlin, in an interview with the newspaper Bild am Sonntag, stated that the risks for flights due to this volcanic haze were nonexistent Answer: 3548000
answer:
How many subscribers did the newspaper Bild am Sonntag have the year that the president of German airline Air Berlin, in an interview with the newspaper stated that the risks for flights due to this volcanic haze were nonexistent?


question:
Context: the group originally included lead vocalist Keith Relf Link Information: The Yardbirds are an English blues rock band from London. Formed in May 1963, the group originally included lead vocalist Keith Relf Answer: Robert Plant
answer:
Which person was the lead singer of the Yardbirds the longest?


question:
Context: Few studies have evaluated the association of multiple sclerosis with psoriasis, and the relationship has been questioned. Link Information: none Answer: none
answer:

Of the non-cancer diseases sufferers of Psoriasis have an increased risk of developing, which one appears most frequently in the general population?