<s>[INST] <<SYS>>
You are a helpful, respectful and honest assistant. Always answer as helpfully as possible, while being safe.  Your answers should not include any harmful, unethical, racist, sexist, toxic, dangerous, or illegal content. Please ensure that your responses are socially unbiased and positive in nature.
If a question does not make any sense, or is not factually coherent, explain why instead of answering something not correct. If you don't know the answer to a question, please don't share false information.
<</SYS>>

Extract from the following context the minimal span word for word that best answers the question. Think step by step and explain your reasoning. Then give the answer in JSON format as follows:
```json
{
  "answer": ...
}
```
If the answer is not in the context, the answer should be "?".
Question: أين أقيم معرض ELEXCON في عام 2009 ؟
Context: في عام 2008 ، بلغت تكلفة محطة BeiDou - 1 الأرضية حوالي 20000 يوان صيني ( 2929 دولارا أمريكيا ) ، أي ما يقرب من 10 أضعاف سعر محطة GPS المعاصرة . وفسرت أسعار المحطات الطرفية بأنها ترجع إلى تكلفة الرقائق الدقيقة المستوردة . في معرض الصين للتكنولوجيا الفائقة ELEXCON في نوفمبر 2009 في شنتشن ، تم تقديم محطة BeiDou بسعر CN 3 , 000 يوان . [/INST] ```json
{<answer_start>
  "answer": "شنتشن"
  <answer_end>
}
``` </s>
في عام 2008 ، بلغت تكلفة محطة BeiDou - 1 الأرضية حوالي 20000 يوان صيني ( 2929 دولارا أمريكيا ) ، أي ما يقرب من 10 أضعاف سعر محطة GPS المعاصرة . وفسرت أسعار المحطات الطرفية بأنها ترجع إلى تكلفة الرقائق الدقيقة المستوردة . في معرض الصين للتكنولوجيا الفائقة ELEXCON في نوفمبر 2009 في شنتشن ، تم تقديم محطة BeiDou بسعر CN 3 , 000 يوان .
أين أقيم معرض ELEXCON في عام 2009 ؟
{'answer_start': [275], 'text': ['شنتشن']}