Generate a question which can yield the answer mentioned in the input. Generated question must be answered by the answer provided in input, without using any extra knowledge.

Context : The 1942 Ruislip Wellington accident occurred on the 18 October 1942 when a Royal Air Force twin-engined Vickers Wellington 1c bomber crashed close to South Ruislip station while on approach to RAF Northolt, all 15 on-board and six on the ground (including four children) were killed. 
Answer : 18 October 1942
What is the full date that 1942 Ruislip Wellington accident crashed on?

Context : Sun Weishi (1921 -- October 15, 1968) was the first female director of modern spoken drama (Huaju) in Chinese history. 
Answer : female
What was Sun Weishi's gender?

Context : Trace of Stones (German: Spur der Steine) is a 1966 East German film by Frank Beyer. 
Answer : Spur der Steine

The Trace of Stones is based upon what?