instruction:
Given a question and a context passage, generate the answer having the word or phrase from the context passage. Here, the answer should be a shortest continous span from the passage.
question:
Context: Mutations of SLC9A6 may cause an X-linked clinical syndrome first described by Christianson in 1999 in which affected males exhibited profound intellectual disability, autism, drug-resistant epilepsy, ophthalmoplegia, mild craniofacial dysmorphism, microcephaly, and ataxia. We describe a child with an SLC9A6 mutation and an electroencephalographic pattern consistent with electrographic status epilepticus of sleep. Our patient's electrographic status epilepticus of sleep resolved after treatment with felbamate. Following treatment, he remained seizure-free but did not make significant or lasting gains in language. Our report extends the clinical epilepsy phenotype in children with SLC9A6 mutations to include electrographic status epilepticus of sleep. In addition, felbamate was an effective treatment for electrographic status epilepticus of sleep in our patient. 
 Question: Mutation of which gene is implicated in the Christianson syndrome?
answer:
slc9a6


question:
Context: The human ETHE1 gene consists of 7 exons and encodes for a protein that is approximately 27 kDa in size. 
 Question: Which species has the ETHE1 gene?
answer:
human


question:
Context: 4-Day Classic Beijing Tour The 4-day classic Beijing tour is designed for tourists who come to visit China for the first time. It covers the most popular and typical places in Beijing, fully displaying the scenery, culture, history, local lifestyles and features, food and drinks, business, etc. for you. Day 1:Arrival in Beijing Your guide meets you at Capital Airport, and helps you check in at your hotel. Enjoy Beijing Duck as welcome dinner. Accommodation: Beijing downtown Day 2:The Great Wall & the Summer Palace Start your day at the most famous part of the Great Wall, the Badaling Great Wall. Leave the downtown for the Great Wall at 8 am. Since it is a long drive to the Great Wall (about 2 hours' riding) have a break at the Jade Museum on the way. Lunch will be enjoyed in a local restaurant. In the early afternoon come back to the city and have a sightseeing tour of the Summer Palace. Recommended Activity: Beijing Opera Show (Liyuan Theatre, 19:30-21: 10 every evening) Accommodation: Beijing downtown Day 3:Beijing city sightseeing & Local experience Your guide meets you at the hotel at 8 am and set out for the day's touring: Tian'anmen Square and the Forbidden City. After visiting the two sites, have a break and get ready for lunch. Hutong visit: see some traditional arts of the old Beijing, such as paper cutting and kite making, and visit a local family. Accommodation: Beijing downtown Day 4:Beijing Olympic sites Visit the Olympic sites: Bird's Nest, Water Cube and Olympic Park, witnessing the fast developing modern China. Enjoy some free time after visiting the sites. After lunch, it is shopping time and then the tour is over. 
 Question: What does this tour company think can show Beijing is a fast developing modern city?
answer:

bird's nest, water cube and olympic park.