Question:
Which position did Olusegun Obasanjo hold in Oct, 1975?

Context:
 Olusegun Obasanjo holds the position of Vice President of Nigeria from Jul, 1975 to Feb, 1976. 
 Olusegun Obasanjo holds the position of Chairperson of the African Union from Jul, 2004 to Jan, 2006. 
 Olusegun Obasanjo holds the position of President of Nigeria from Feb, 1976 to Sep, 1979.

Answer:
Vice President of Nigeria