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

Ex Input:
Passage: Biotechnology has been used to create transgenic crops. Transgenic crops are genetically modified with new genes that code for traits useful to humans. The diagram in Figure below shows how a transgenic crop is created. You can learn more about how scientists create transgenic crops with the interactive animation "Engineer a Crop: Transgenic Manipulation" at this link: http://www. pbs. org/wgbh/harvest/engineer/transgen. html . Answer: transgenic

Ex Output:
What is the term for crops that are genetically modified with new genes that code for traits useful to humans?

Ex Input:
Passage: An atom's protons and electrons carry electrical charges. Protons, with their positive charge, are designated p+. Electrons, which have a negative charge, are designated e. An atom's neutrons have no charge: they are electrically neutral. Just as a magnet sticks to a steel refrigerator because their opposite charges attract, the positively charged protons attract the negatively charged electrons. This mutual attraction gives the atom some structural stability. The attraction by the positively charged nucleus helps keep electrons from straying far. The number of protons and electrons within a neutral atom are equal, thus, the atom's overall charge is balanced. Answer: neutrons

Ex Output:
What part of an atom is electrically neutral?

Ex Input:
Passage: Stuart Chalmers. Cows digest cellulose with the aid of methanogens . CC BY 2.0. Answer: cows

Ex Output:
Which of the animals digest cellulose with the aid of methanogens?