Question: The person who was Nixon's prime subject officially opened which Winter Olympics?
Choices: 1968 Winter Olympics
1960 Winter Olympics
2006 Winter Olympics
2010 Winter Olympics
1984 Winter Olympics
1992 Winter Olympics
1994 Winter Olympics
1952 Winter Olympics
1948 Winter Olympics
1998 Winter Olympics
SPARQL: SELECT DISTINCT ?e WHERE { ?e <pred:instance_of> ?c . ?c <pred:name> "Winter Olympic Games" . ?e <officially_opened_by> ?e_1 . ?e_1 <pred:instance_of> ?c_1 . ?c_1 <pred:name> "human" . ?e_2 <main_subject> ?e_1 . ?e_2 <pred:name> "Nixon" .   }
Program:
function: Find
inputs: Nixon
function: Relate
dependencies: 0
inputs: main subject
forward
function: FilterConcept
dependencies: 1
inputs: human
function: Relate
dependencies: 2
inputs: officially opened by
backward
function: FilterConcept
dependencies: 3
inputs: Winter Olympic Games
function: What
dependencies: 4
Answer: 1960 Winter Olympics