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: His doctoral thesis under the supervision of Charles Tart was on the phenomenology of deep states of hypnosis. He subsequently went on to do post-doctoral work in the area of dissociation and hypnosis at Stanford University under David Spiegel. Link Information: none Answer: none
answer:
Which doctorate and post doctorate supervisor's that Cardena worked under was older?


question:
Context: During the Battle of Narva, the Russian army was defeated by Charles XII. Link Information: Charles XII positioned his 10,500 men (another 2,000 men were garrisoned in the city and would take part in the battle at a later stage) opposite the besieging Russian army of about 34,000 to 40,000 troops.
 Answer: 12500
answer:

What was the size of Charles XII's army in the Battle of Narva?