Question: Which soft drink was originally developed in 1940 in Tennessee, Dr Pepper or Mountain Dew?

Context paragraphs:
Diet Mountain Dew: Diet Mountain Dew is a no-calorie Mountain Dew that was first introduced in 1986.  It was formerly known as "Sugar-Free Mountain Dew" until 1986, when it was given its current name.  In 2006 Diet Mountain Dew was reformulated with a new "Tuned Up Taste", using a blend of sucralose, aspartame, and acesulfame potassium as sweeteners.  The previous formulation was sweetened exclusively with aspartame.  In limited areas in the United States, Diet Mountain Dew has treated water instead of carbonated water as a fountain drink.

Dublin Dr Pepper: Dublin Dr Pepper was the popular name for a style of Dr Pepper soft drink made by the Dublin Dr Pepper Bottling Company in Dublin, Texas.  Dublin Dr Pepper followed the original recipe, using cane sugar as the sweetener as opposed to newer high fructose corn syrup (HFCS).  The Dublin plant formula's use of sugar made it popular among soda fans.  According to the corporate headquarters at Dr Pepper Snapple Group, this resulted in clashes with other bottlers and the parent company of Dr Pepper.  On 12 January 2012, it was announced that Dublin Dr. Pepper will no longer be produced, after the Dublin Dr Pepper Bottling Company settled the trademark dispute instigated by Dr Pepper Snapple Group.

Dr Pepper Ballpark: Dr Pepper Ballpark (formerly Dr Pepper/Seven Up Ballpark) is the home ballpark of the Frisco RoughRiders Class AA minor league baseball club.  Located in Frisco, Texas in the United States, the stadium has a capacity of 10,316.  The ballpark is host to numerous functions in addition to minor league baseball games, including corporate and charity events, wedding receptions, city of Frisco events, and church services.  Local soft drink manufacturer Dr Pepper Snapple Group holds naming rights and exclusive non-alcoholic beverage rights in the park.

Dr Pepper: Dr Pepper is a carbonated soft drink marketed as having a unique flavor.  The drink was created in the 1880s by Charles Alderton in Waco, Texas and first served around 1885.  Dr Pepper was first nationally marketed in the United States in 1904, and is now also sold in Europe, Asia, Canada, Mexico, Australia, and South America, as well as New Zealand and South Africa as an imported good.  Variants include a version without high fructose corn syrup, Diet Dr Pepper, as well as a line of additional flavors, first introduced in the 2000s.

Mountain Dew: Mountain Dew (sometimes stylized as Mtn Dew) is a carbonated soft drink brand produced and owned by PepsiCo.  The original formula was invented in 1940 by Tennessee beverage bottlers Barney and Ally Hartman.  A revised formula was created by Bill Bridgforth in 1958.  The rights to this formula were obtained by the Tip Corporation of Marion, Virginia.  William H. "Bill" Jones of the Tip corporation further refined the formula, launching that version of Mountain Dew in 1961.  In August 1964, the Mountain Dew brand and production rights were acquired from Tip by the Pepsi-Cola company, at which point distribution expanded more widely across the United States and Canada.

Pepsi-Cola Made with Real Sugar: The Pepsi-Cola Made with Real Sugar, formerly called Throwback, is a brand of soft drink sold by PepsiCo in the United States and in sweet stores in South Australia for its flagship Pepsi and Mountain Dew brands.  The drinks, called Pepsi Throwback and Mountain Dew Throwback, are named as such because they are flavored with cane sugar and beet sugar instead of high fructose corn syrup, which soft drink companies used to replace sugar (in their North American products) in the 1980s.  In addition, these drinks use retro packaging.  As of June 2014, Pepsi Throwback has been replaced in some areas of the United States by "Pepsi-Cola Made with Real Sugar", a new product formulation, also made without high fructose corn syrup.

List of citrus soft drinks: In addition to Pepsi's Mountain Dew, Coca-Cola's Mello Yello or Dr Pepper's Sun Drop, there are a variety of smaller or regional brands for citrus soda.  In deference to Mountain Dew's leading position in the market segment, some brands also use the word "Mountain" in their names.

Surge (drink): Surge (sometimes styled as SURGE) is a citrus flavored soft drink first produced in the 1990s by The Coca-Cola Company to compete with Pepsi's Mountain Dew.  Surge was advertised as having a more "hardcore" edge, much like Mountain Dew's advertising at the time, in an attempt to lure customers away from Pepsi.  It was originally launched in Norway as Urge, and was so popular that it was later released in America as Surge.  Lagging sales caused production to be ended in 2006 for most markets, and by 2014 Norway was the last country where either Urge or Surge were still sold.

Diet Dr Pepper: Diet Dr Pepper is a no-calorie Dr Pepper that was first introduced in 1986.  This version replaces the high fructose corn syrup found in the original with aspartame.  Diet Cherry Chocolate Dr Pepper (2007–2008) was introduced as a limited edition flavor on November 21, 2007.  It was discontinued in April 2008.  It became available in Canada in early January 2008.  A nondiet version was never created.  The taste is similar to Canfield's Diet Cherry Chocolate Fudge Soda, but with the distinctive Dr Pepper flavor.  It was featured in the song "Cherry Chocolate Rain" by YouTube celebrity Tay Zonday.  Upon ceasing production, it was replaced by Cherry Vanilla Dr Pepper.

Sun Drop: Sun Drop, also marketed as Sundrop, is a citrus-flavored soda produced by Dr Pepper Snapple Group.  It has a yellowish-green color imparted by Yellow 5.  Among soft drinks, it is known for its high caffeine content (63 mg per 12 oz can, 9 mg higher than a 12 oz can of Mountain Dew, but not as much as Vault with 70.5 mg per 12 oz can).  Orange juice is an ingredient in the drink, and remaining pulp matter from the orange juice provides some of the soft drink's taste and appearance.

Supporting paragraphs: Dr Pepper Mountain Dew
Answer: Mountain Dew