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

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

Example Input: Passage: Static electricity is a buildup of electric charges on objects. It occurs when electrons are transferred from one object to another. Answer: static electricity
Example Output: What is the term for the buildup of electric charge on an object, which can be transferred to another when touched?

Example Input: Passage: Today in many countries, death rates have gone down but birth rates remain high. This means that the population is growing. Figure below shows the growth rates of human populations all over the world. Answer: pulmonary
Example Output:
Which veins return oxygen-rich blood from the lungs to the heart?