Question:
Which position did Cyril Smith hold in May, 1987?

Context:
 Cyril Smith holds the position of Member of the 48th Parliament of the United Kingdom from May, 1979 to May, 1983. 
 Cyril Smith holds the position of Member of the 50th Parliament of the United Kingdom from Mar, 1988 to Mar, 1992. 
 Cyril Smith holds the position of Liberal Democrats Chief Whip from Jul, 1976 to Jan, 1977. 
 Cyril Smith holds the position of Member of the 47th Parliament of the United Kingdom from Oct, 1974 to Apr, 1979. 
 Cyril Smith holds the position of Member of the 45th Parliament of the United Kingdom from Oct, 1972 to Feb, 1974. 
 Cyril Smith holds the position of Member of the 49th Parliament of the United Kingdom from Jun, 1983 to May, 1987. 
 Cyril Smith holds the position of Member of the 46th Parliament of the United Kingdom from Feb, 1974 to Sep, 1974.

Answer:
Member of the 49th Parliament of the United Kingdom