question: Are David Paton and Robb Flynn both guitarists ?
answer: yes
context: Title: Robb Flynn
  Passage: Robert Conrad "Robb" Flynn (born Lawrence Matthew Cardine; July 19, 1967) is the lead vocalist and guitarist for the heavy metal band Machine Head.  Flynn formed the band along with Adam Duce, Logan Mader and Tony Costanza after leaving Bay Area thrash band Vio-Lence.
  Title: David Paton
  Passage: David Paton (born 29 October 1949, Edinburgh, Scotland) is a Scottish bassist, guitarist and singer.
  Title: David Paton (ophthalmologist)
  Passage: David Paton, MD (born August 16, 1930) is a retired full-time ophthalmologist best known as Founder in 1970 of Project Orbis (now named Orbis International, Inc.) and thereafter as its first Medical Director helping to develop (1970–1982) and then deploy its teaching aircraft for ophthalmologists worldwide, especially in the developing nations.  The initial aircraft was a donated DC-8 refurbished to contain an operating room, a teaching classroom and the necessary ancillary components for sharing “live” both surgical and medical techniques with colleagues abroad who were eager to learn by means of hands-on instruction.  The instruction was provided by volunteer American and other skilled medical teachers from an eventually large number of countries.  In 1988, the DC-8 was replaced by a larger and more complete teaching aircraft complex, housed in a formerly commercial DC-10.  Thus far 88 countries have been visited, some repeatedly.  By 2012, still another update of the Orbis aircraft will be prepared to further fulfill the various purposes of teaching optimal eye care internationally, principally by means of doctor-to-doctor techniques.  Paton resigned from Orbis in 1987 and focused on other aspects of academic ophthalmology, but in 2011 he returned in a voluntary capacity to assist in fund raising for a new annual appointment, the David Paton Orbis Fellowship in Global Ophthalmology
citations: David Paton Robb Flynn