Question:
Which employer did Kai-Fu Lee work for in Apr, 1991?

Context:
 Kai-Fu Lee works for Google from Jan, 2005 to Jan, 2009. 
 Kai-Fu Lee works for Carnegie Mellon University from Jan, 1988 to Jan, 1990. 
 Kai-Fu Lee works for Apple Inc. from Jan, 1990 to Jan, 1996. 
 Kai-Fu Lee works for Silicon Graphics from Jan, 1996 to Jan, 1998. 
 Kai-Fu Lee works for Microsoft Corporation from Jan, 1998 to Jan, 2005.

Answer:
Question:
Which employer did Kai-Fu Lee work for in Apr, 1991?

Context:
 Kai-Fu Lee works for Google from Jan, 2005 to Jan, 2009. 
 Kai-Fu Lee works for Carnegie Mellon University from Jan, 1988 to Jan, 1990. 
 Kai-Fu Lee works for Apple Inc. from Jan, 1990 to Jan, 1996. 
 Kai-Fu Lee works for Silicon Graphics from Jan, 1996 to Jan, 1998. 
 Kai-Fu Lee works for Microsoft Corporation from Jan, 1998 to Jan, 2005.

Answer:
user
Apple Inc.
assistant
Question:
Which employer did Kai-Fu Lee work for in Apr, 1991?

Context:
 Kai-Fu Lee works for Google from Jan, 2005 to Jan, 2009. 
 Kai-Fu Lee works for Carnegie Mellon University from Jan, 1988 to Jan, 1990. 
 Kai-Fu Lee works for Apple Inc. from Jan, 1990 to Jan, 1996. 
 Kai-Fu Lee works for Silicon Graphics from Jan, 1996 to Jan, 1998. 
 Kai-Fu Lee works for Microsoft Corporation from Jan, 1998 to Jan, 2005.

Answer:
user
Microsoft Corporation
Silicon Graphics
Carnegie Mellon University
Google
assistant
Question:
Which employer did Kai-Fu Lee work for in Apr, 1991?

Context:
 Kai-Fu Lee works for Google from Jan, 2005 to Jan, 2009. 
 Kai-Fu Lee works for Carnegie Mellon University from Jan, 1988 to Jan, 1990. 
 Kai-Fu Lee works for Apple Inc. from Jan, 1990 to Jan, 1996. 
 Kai-Fu Lee works for Silicon Graphics from Jan, 1996 to Jan, 1998. 
 Kai-Fu Lee works for Microsoft Corporation from Jan, 1998 to Jan, 2005.

Answer:
user
Apple Inc.
assistant