Question:
Who was the chair of Grand Orient of the Netherlands in Apr, 1871?

Context:
 Prince Frederick of the Netherlands is the chair of Grand Orient of the Netherlands from Jan, 1816 to Jan, 1881. 
 Cornelis Bijleveld is the chair of Grand Orient of the Netherlands from Jan, 1804 to Jan, 1810. 
 Willem Philip Barnaart is the chair of Grand Orient of the Netherlands from Jan, 1812 to Jan, 1816. 
 Prince Alexander, Prince of Orange is the chair of Grand Orient of the Netherlands from Jan, 1882 to Jan, 1884. 
 Johan Radermacher is the chair of Grand Orient of the Netherlands from Jan, 1735 to Jan, 1748. 
 Pieter Johannes Gesinus van Diggelen is the chair of Grand Orient of the Netherlands from Jan, 1885 to Jan, 1892. 
 Hermannus van Tongeren sr. is the chair of Grand Orient of the Netherlands from Jan, 1929 to Jan, 1941. 
 Carel van Boetzelaer is the chair of Grand Orient of the Netherlands from Jan, 1759 to Jan, 1798.

Answer:
Question:
Who was the chair of Grand Orient of the Netherlands in Apr, 1871?

Context:
 Prince Frederick of the Netherlands is the chair of Grand Orient of the Netherlands from Jan, 1816 to Jan, 1881. 
 Cornelis Bijleveld is the chair of Grand Orient of the Netherlands from Jan, 1804 to Jan, 1810. 
 Willem Philip Barnaart is the chair of Grand Orient of the Netherlands from Jan, 1812 to Jan, 1816. 
 Prince Alexander, Prince of Orange is the chair of Grand Orient of the Netherlands from Jan, 1882 to Jan, 1884. 
 Johan Radermacher is the chair of Grand Orient of the Netherlands from Jan, 1735 to Jan, 1748. 
 Pieter Johannes Gesinus van Diggelen is the chair of Grand Orient of the Netherlands from Jan, 1885 to Jan, 1892. 
 Hermannus van Tongeren sr. is the chair of Grand Orient of the Netherlands from Jan, 1929 to Jan, 1941. 
 Carel van Boetzelaer is the chair of Grand Orient of the Netherlands from Jan, 1759 to Jan, 1798.

Answer:
user
Prince Frederick of the Netherlands
assistant
Question:
Who was the chair of Grand Orient of the Netherlands in Apr, 1871?

Context:
 Prince Frederick of the Netherlands is the chair of Grand Orient of the Netherlands from Jan, 1816 to Jan, 1881. 
 Cornelis Bijleveld is the chair of Grand Orient of the Netherlands from Jan, 1804 to Jan, 1810. 
 Willem Philip Barnaart is the chair of Grand Orient of the Netherlands from Jan, 1812 to Jan, 1816. 
 Prince Alexander, Prince of Orange is the chair of Grand Orient of the Netherlands from Jan, 1882 to Jan, 1884. 
 Johan Radermacher is the chair of Grand Orient of the Netherlands from Jan, 1735 to Jan, 1748. 
 Pieter Johannes Gesinus van Diggelen is the chair of Grand Orient of the Netherlands from Jan, 1885 to Jan, 1892. 
 Hermannus van Tongeren sr. is the chair of Grand Orient of the Netherlands from Jan, 1929 to Jan, 1941. 
 Carel van Boetzelaer is the chair of Grand Orient of the Netherlands from Jan, 1759 to Jan, 1798.

Answer:
user
Prince Alexander, Prince of Orange
Willem Philip Barnaart
Johan Radermacher
Pieter Johannes Gesinus van Diggelen
Cornelis Bijleveld
Hermannus van Tongeren sr.
Carel van Boetzelaer
assistant
Question:
Who was the chair of Grand Orient of the Netherlands in Apr, 1871?

Context:
 Prince Frederick of the Netherlands is the chair of Grand Orient of the Netherlands from Jan, 1816 to Jan, 1881. 
 Cornelis Bijleveld is the chair of Grand Orient of the Netherlands from Jan, 1804 to Jan, 1810. 
 Willem Philip Barnaart is the chair of Grand Orient of the Netherlands from Jan, 1812 to Jan, 1816. 
 Prince Alexander, Prince of Orange is the chair of Grand Orient of the Netherlands from Jan, 1882 to Jan, 1884. 
 Johan Radermacher is the chair of Grand Orient of the Netherlands from Jan, 1735 to Jan, 1748. 
 Pieter Johannes Gesinus van Diggelen is the chair of Grand Orient of the Netherlands from Jan, 1885 to Jan, 1892. 
 Hermannus van Tongeren sr. is the chair of Grand Orient of the Netherlands from Jan, 1929 to Jan, 1941. 
 Carel van Boetzelaer is the chair of Grand Orient of the Netherlands from Jan, 1759 to Jan, 1798.

Answer:
user
Prince Frederick of the Netherlands
assistant