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.
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Question: Context : 45 Commando Royal Marines (pronounced ``four-five commando'') is a battalion sized unit of the British Royal Marines and subordinate unit within 3 Commando Brigade Royal Marines, the principal Commando formation, under the Operational Command of Commander in Chief Fleet. 
Answer : Royal Marines

Answer: What military organization did 45 Commando belong to?


Question: 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

Answer: What is the full date that 1942 Ruislip Wellington accident crashed on?


Question: Context : The GER Class Y65 was a class of twelve 2-4-2T steam locomotives designed by S. D. Holden and built by the company's Stratford Works in 1909--1910. 
Answer : 1909

Answer:
What year was GER Class Y65 introduced?