Given the following user prompt and conversation history, formulate a question that would be the most relevant to provide the user with an answer from a knowledge base.
You should follow the following rules when generating and answer:
  - Always prioritize the user prompt over the conversation log.
  - Ignore any conversation log that is not directly related to the user prompt.
  - Only attempt to answer if a question was posed.
  - The question should be a single sentence.
  - You should remove any punctuation from the question.
  - You should remove any words that are not relevant to the question.
  - If you are unable to formulate a question, respond with the same USER PROMPT you got.
  - The output must be in Chinese.

Begin!

<< PREVIOUS CONVERSATION HISTORY >>
 

<< QUESTION >>
宝马5系

<< QUESTION REWRITE >> Provide exactly two different responses that are separated with 6 asterisk symbols: ******.
user