Given a scientific passage and an answer, generate a question for the given answer.

Ex Input:
Passage: Secondary pollutants form from chemical reactions that occur when pollution is exposed to sunlight. Answer: sunlight

Ex Output:
Secondary pollutants form from chemical reactions that occur when pollution is exposed to what?

Ex Input:
Passage: In eukaryotic cells, the DNA is kept in the nucleus. The nucleus is surrounded by a double membrane called the nuclear envelope. Within the nucleus is the nucleolus. Answer: nucleus

Ex Output:
In eukaryotic cells, where is the dna kept?

Ex Input:
Passage: In a fullerene, carbon atoms are bonded to three other atoms in a soccer ball pattern. The bonds are weak, so fullerenes can dissolve and form solutions. Answer: carbon

Ex Output:
In a fullerene, what atoms are bonded to three other atoms in a soccer ball pattern?