Question: Between the Irish Red and White Setter and American Foxhound, which bread of dog is considered to hunt foxes by scent?

Context paragraphs:
English Setter: The English Setter is a medium size breed of dog.  It is part of the Setter family, which includes the red Irish Setters, Irish Red and White Setters, and black-and-tan Gordon Setters.  The mainly white body coat is of medium length with long silky fringes on the back of the legs, under the belly and on the tail.  The coat features flecks of colour, and the different colour varieties are referred to as belton.

Irish Setter: The Irish Setter (Irish: "sotar rua" , literally "red setter") is a setter, a breed of gundog, and family dog.  The term "Irish Setter" is commonly used to encompass the show-bred dog recognised by the American Kennel Club as well as the field-bred Red Setter recognised by the Field Dog Stud Book.

Black and Tan Virginia Foxhound: The Black and Tan Virginia Foxhound is an American foxhound breed.  It resulted of a cross breed with Bloodhounds in the 1700s.  The breed was developed by the landed gentry in order to get a dog suitable for fox hunting.  Besides the Black and Tan there are the Walker, Calhoun, Penn-Marydel, Goodman, July and Trigg, which all developed from similar crosses.  The Black and Tan is believed to descend form hunting dogs imported to America by Robert Brooke in 1650.  These hunting dogs were the ancestors of several varieties of American hounds and stayed with the Brooke family for more than 300 years.  Afterwards French Foxhounds were bred in after George Washington received them as gifts from the Marquis de Lafayette.  Much later, the breed's speed and stamina were improved introducing Irish Foxhounds.

American Foxhound: The American Foxhound is a breed of dog that is a cousin of the English Foxhound.  They are scent hounds, bred to hunt foxes by scent.

Florence Nagle: Florence Nagle (26 October 1894 – 30 October 1988) was a trainer and breeder of racehorses, a breeder of pedigree dogs, and an active feminist.  Nagle purchased her first Irish Wolfhound in 1913, and went on to own or breed twenty-one United Kingdom Champions.  Best in Show at Crufts in 1960 was awarded to Sulhamstead Merman, who was bred, owned and exhibited by Nagle.  She also competed successfully in field trials with Irish Setters, from the 1920s until the mid-1960s resulting in eighteen Field Trial Champions.  The male dog who was a linchpin in the 1970s revival of the Irish Red and White Setter breed was descended from one of Nagle's Irish Setters.

Trigg Hound: The Trigg Hound (also known as the Trigg Foxhound or Hayden Trigg Hound) is a variety of the American Foxhound, developed in Kentucky by Colonel Haiden Trigg.

Gordon Setter: The Gordon Setter is a large breed of dog, a member of the setter family that also includes both the better-known Irish Setter and the English Setter.  Setter breeds are classified as members of either the Sporting or Gundog Group depending on the national kennel club or council.  The original purpose of the breed was to hunt gamebirds.  Their quarry in the United Kingdom, may be partridge or grouse, pheasant, ptarmigan, blackgame, snipe or woodcock: whilst overseas bird dogs are worked on quail, willow grouse, sand grouse, guinea fowl, sagehen, francolin and any other bird that will sit to a dog—that is to say, will attempt to avoid a potential predator by concealment rather than by taking to the wing at the first sign of danger.  It is this combination of a bird that will sit fast in front of a dog that will remain on point that makes bird dog work possible.

Irish Red and White Setter: The Irish Red and White Setter () is a breed of dog, more specifically a setter.  As with all the setters and the Pointer, it is classified as a gundog in the UK and is included in the sporting group in America and Canada.  It is virtually identical in use and temperament to the related Irish Setter and its other setter cousins, the Gordon and English setters, but is more often found as a working gun dog.

Noble Huston: The Reverend Noble Huston (died 1944), was the minister of the First Presbyterian Church in Ballynahinch, County Down and a breeder of dogs, credited with saving the Irish Red and White Setter from extinction in the early the twentieth century.  According to Anna Redlich in “The Dogs of Ireland” (Dundalgan Press 1949), he " mated his half red and half red and white bitch Gyp to Johnnie, and later on to Glen of Rossmore ... Thus in due time and by judicious selection , he managed to build up a kennel of Red and White Setters..."

English Foxhound: The English Foxhound is one of the four foxhound breeds of dog.  It is a cousin of the American Foxhound.  They are scent hounds, bred to hunt foxes by scent.

Supporting paragraphs: Irish Red and White Setter American Foxhound
Answer: American Foxhound