Question:
Which position did Gareth Evans hold in Apr, 1988?

Context:
 Gareth Evans holds the position of Minister for Infrastructure and Transport from Jul, 1987 to Sep, 1988. 
 Gareth Evans holds the position of Minister for Industry and Innovation from Dec, 1984 to Jul, 1987. 
 Gareth Evans holds the position of Minister for Foreign Affairs from Sep, 1988 to Mar, 1996. 
 Gareth Evans holds the position of Delegate to the Australian Constitutional Convention, 1998 from Feb, 1998 to Feb, 1998. 
 Gareth Evans holds the position of Member of the Australian Senate from Jul, 1978 to Mar, 1996. 
 Gareth Evans holds the position of Attorney-General for Australia from Mar, 1983 to Dec, 1984. 
 Gareth Evans holds the position of Member of the Australian House of Representatives from Mar, 1996 to Sep, 1999. 
 Gareth Evans holds the position of Leader of the Government in the Senate from Mar, 1993 to Mar, 1996.

Answer:
Minister for Infrastructure and Transport