You are given a background paragraph that describes one or more causal or qualitative relationships such as a relationship in economics or a scientific law and a story that makes use of the concepts or the relationship described in the provided paragraph. You are also given a question about the story that requires an understanding of the relationship described in the background paragraph and the story. You need to come up with an answer to the given question; the answer will be a span from either the question or the story. In order to correctly answer the given question, you need to understand the relationship mentioned in the background paragraph and should be able to use it to understand that in the story. Your answer can not consist of any word that is not mentioned in any of these: the background paragraph, the story, or the question. You can directly copy and paste a span from the story or the question while answering the given question.

Example Input: Background Paragraph: When peer feedback is established it allows students to interact with their peers and creates high social skills while learning material more effectively. Interaction with other students allows students to have better social approaches when interacting. Learning by peer feedback gives students more of an opportunity to work as a unit instead of individuals working alone. Working in groups gives students more useful life skill that well help prepare them for the future. Peer feedback gives more control to the student, the student can decide if they want to use the criticism their peers are giving them or not. When given options more students are more likely to give and absorb more feedback. Peer feedback has confirmed an increase in affect; students that have increasing responsibilities have more drive towards their work and a spike in confidence.[6] Furthermore, Kristanto (2018) found that peer feedback is an essential element of peer assessment. In peer assessment, feedback from peers can provide suggestions or correction for students' future works as companion of the received grade.[7]. 
Story: Two school districts adopted two different strategies in educating their students. Park's district made the students work in groups at all times, the students from Lake's district were instructed to work by themselves and in isolation. 
Question: Which district's students learned fewer useful life skills that well help prepare them for the future?
Example Output: Lake's.

Example Input: Background Paragraph: Mechanical weathering increases the rate of chemical weathering. As rock breaks into smaller pieces, the surface area of the pieces increases. With more surfaces exposed, there are more places for chemical weathering to occur ( Figure below ). Let’s say you wanted to make some hot chocolate on a cold day. It would be hard to get a big chunk of chocolate to dissolve in your milk or hot water. Maybe you could make hot chocolate from some smaller pieces like chocolate chips, but it is much easier to add a powder to your milk. This is because the smaller the pieces are, the more surface area they have. Smaller pieces dissolve more easily. 
Story: Rocks commonly found in Beijing are often found spread out in smaller pieces, whereas rocks in Montreal typically remain large in size and don't break apart as much. Both Beijing and Montreal are expected to experience bouts of acid rain in the upcoming weeks. 
Question: Which area's rocks will have higher rates of chemical weathering caused by the acid rain?
Example Output: Beijing.

Example Input: Background Paragraph: Unfortunately, the layer of good ozone is being destroyed by air pollution. The chief culprits are chlorine and bromine gases. They are released in aerosol sprays, coolants, and other products. Loss of ozone has created an ozone hole over Antarctica. Ozone depletion results in higher levels of UV radiation reaching Earth. In humans, this increases skin cancers and eye cataracts. It also disturbs the nitrogen cycle, kills plankton, and disrupts ocean food webs. The total loss of the ozone layer would be devastating to most life. It’s rate of loss has slowed with restrictions on pollutants, but it is still at risk. 
Story: A new Earth like planet, recently named Moolton, has been discovered near the outer rim of our galaxy. Scientists have managed to send a rover there and are currently analyzing the planet. They have discovered that the atmospheres of the two planets are composed of the same things, and the surface of Moolton and the species on it are nearly identical to Earth. The only difference is that Moolton is not populated by intelligent life such as humans. So, it is a very natural planet with no industrialization which means there is less chlorine gas being secreted into the atmosphere. 
Question: Which planet's ozone layer is stronger?
Example Output:
Moolton.