Question:
Which position did David Lindsay, 28th Earl of Crawford hold in May, 1937?

Context:
 David Lindsay, 28th Earl of Crawford holds the position of Member of the 37th Parliament of the United Kingdom from Nov, 1935 to Mar, 1940. 
 David Lindsay, 28th Earl of Crawford holds the position of Member of the 34th Parliament of the United Kingdom from Oct, 1924 to May, 1929. 
 David Lindsay, 28th Earl of Crawford holds the position of Member of the 36th Parliament of the United Kingdom from Oct, 1931 to Oct, 1935. 
 David Lindsay, 28th Earl of Crawford holds the position of Member of the House of Lords from Mar, 1940 to Dec, 1975. 
 David Lindsay, 28th Earl of Crawford holds the position of Member of the 35th Parliament of the United Kingdom from May, 1929 to Oct, 1931.

Answer:
Member of the 37th Parliament of the United Kingdom