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.

original question: What is the aviation incident of [Canadair North Star]?
answer: trans-canada air lines flight 810, stockport air disaster, 1956 boac canadair c4 argonaut accident
answer type: Aviation incident.
auxiliary information: The Canadair North Star was a 1940s Canadian development of the Douglas C-54 / DC-4 aircraft. Instead of radial piston engines found on the Douglas design, Canadair used Rolls-Royce Merlin engines to achieve a faster cruising speed. The prototype flew on 15 July 1946 and the type was used by various airlines and by the RCAF. It provided reliable, if noisy, service through the 1950s and into the 1960s. Some examples continued to fly into the 1970s, converted to cargo aircraft.
[Canadair North Star] is what aviation incident?

original question: What is the anchor of [Dallas‚ÄìFort Worth metroplex]
answer: dallas, fort worth
answer type: Metropolitan area anchor.
auxiliary information: The Dallas‚ÄìFort Worth‚ÄìArlington, TX Metropolitan Statistical Area, the official title designated by the United States Office of Management and Budget, encompasses 12 counties within the U.S. state of Texas. The area is divided into two distinct metropolitan divisions: Dallas‚ÄìPlano‚ÄìIrving and Fort Worth‚ÄìArlington. Residents of the area informally refer to it as the Dallas/Fort Worth Metroplex, DFW, or The Metroplex. It is the economic and cultural hub of the region commonly called North Texas or North Central Texas and is the largest land-locked metropolitan area in the United States. The 2014 official estimate U.S. Census has the Dallas‚ÄìFort Worth Metroplex at 6,954,330, making it the largest metropolitan area in the South. During the 12-month period from July 2008 to July 2009, the Dallas‚ÄìFort Worth‚ÄìArlington metropolitan area gained 146,530 new residents, more than any other metropolitan area in the United States. The area's population has grown by about one million since the 2000 US census.
Which metropolitan area is the anchor of the [Dallas‚ÄìFort Worth metroplex]?

original question: Which chemical series is the element with greatest van der waals radius in along with [Oxygen]?
answer: period 2 element
answer type: Chemical Series.
auxiliary information: Oxygen is a chemical element with symbol O and atomic number 8. It is a member of the chalcogen group on the periodic table and is a highly reactive nonmetallic element and oxidizing agent that readily forms compounds with most elements. Photosynthesis releases oxygen, and respiration consumes oxygen. Changes in phosphate are related to changes in oxygen concentrations. Oxygen was discovered independently by Carl Wilhelm Scheele, in Uppsala, in 1773 or earlier, and Joseph Priestley in Wiltshire, in 1774, but Priestley is often given priority because his work was published first. The name oxygen was coined in 1777 by Antoine Lavoisier, whose experiments with oxygen helped to discredit the then-popular phlogiston theory of combustion and corrosion. Its name derives from the Greek roots ·ΩÄŒæœçœÇ oxys, "acid", literally "sharp", referring to the sour taste of acids and -Œ≥ŒµŒΩŒÆœÇ -genes, "producer", literally "begetter", because at the time of naming, it was mistakenly thought that all acids required oxygen in their composition.

Which atomic number element in the chemical series that includes [Oxygen] has the great greatest van der waals radius?