Definition: Compose a new way to ask the same question. The new question must be asking the exact same thing as the original question does. Without any other information, you should be able to tell that the original question and the new question are the same. Preserve bracketed phrases in your new question. You can change the rest of the question provided the above requirements are satisfied. The new question must have a natural, fluent formulation, as if it were composed by a native English speaker. You will be given three pieces of information to help you create better questions. Those are: "Answer": the answer to the question, e.g., "Honolulu". "Answer Type": the type of the answer, e.g., "Location". "Auxiliary Information" is a detailed description of some concepts mentioned in the question, if any.
Input: original question: Which engine was designed by [Rolls-Royce Holdings]?
answer: rolls-royce merlin
answer type: Engine.
auxiliary information: Rolls-Royce Holdings plc is a British multinational public holding company that, through its various subsidiaries, designs, manufactures and distributes turbine-based power systems for aviation and other industries. Rolls-Royce Holdings is headquartered in City of Westminster, London. It is the world‚Äôs second-largest maker of aircraft engines, and also has major businesses in the marine propulsion and energy sectors. Rolls-Royce was the world's 16th-largest defence contractor in 2011 and 2012 when measured by defence revenues. It had an announced order book of ¬£71.6 billion as of January 2014. Rolls-Royce is listed on the London Stock Exchange and is a constituent of the FTSE 100 Index. As of June 2013, it had a market capitalisation of ¬£22.22 billion, the 24th-largest of any company with a primary listing on the London Stock Exchange.

[Rolls-Royce Holdings] is known for designing what engine?