Question: What French formula racing driver that was 2014 Formula Renault 3.5 Series runner-up drove the Toro Rosso STR12 in 2017, a Formula One racing car designed and constructed by Scuderia Toro Rosso?

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Toro Rosso STR12: The Toro Rosso STR12 is a Formula One racing car designed and constructed by Scuderia Toro Rosso to compete during the 2017 Formula One season.  The car made its competitive début at the 2017 Australian Grand Prix and is driven by Daniil Kvyat and Carlos Sainz, Jr. Pierre Gasly replaced Kvyat ahead of the 2017 Malaysian Grand Prix.  The STR12 is powered by engines supplied by Renault after the team used 2015-specification Ferrari power units throughout the season; however, the engines were rebadged and the engine and chassis package run under the name 'Toro Rosso'.

Sébastien Buemi: Sébastien Olivier Buemi (born 31 October 1988) is a Swiss professional racing driver, who formerly competed for Scuderia Toro Rosso in Formula One.  Buemi is currently a reserve driver for Scuderia Toro Rosso's sister team, Red Bull Racing, as well as being a member of Toyota's FIA World Endurance Championship squad and e.dams Renault in the FIA Formula E Championship.  Along with teammate Anthony Davidson, Buemi became World Champion in the LMP1 class of the FIA World Endurance Championship, in 2014.  He won the second ever Formula E championship, the season held across 2015–2016, by two points for setting the fastest lap time in the final race despite not finishing the event.

Toro Rosso STR7: The Toro Rosso STR7, initially referred to as the TR7, is a Formula One racing car designed by Scuderia Toro Rosso for the 2012 Formula One season.  It was the seventh car run by the team, and the third car that they have developed since the introduction of rules in 2010 prohibiting teams from using a "customer chassis", or a design that had previously been used by another team.  The car was driven by Daniel Ricciardo and Jean-Éric Vergne after the team elected not to renew the contracts of former drivers Sébastien Buemi and Jaime Alguersuari, and was launched on 7 February at the first winter test of the season at Jerez de la Frontera.

Toro Rosso STR11: The Toro Rosso STR11 is a Formula One racing car designed by Scuderia Toro Rosso to compete in the 2016 Formula One season.  The car was driven by Carlos Sainz, Jr. and Daniil Kvyat, who swapped seats with Max Verstappen, who drove the car in the first four Grands Prix of the season.  It used Ferrari's -specification power unit, the 060.

Pierre Gasly: Pierre Gasly (born 7 February 1996 in Rouen) is a French formula racing driver, who was the 2014 Formula Renault 3.5 Series runner-up and the 2016 GP2 Series champion.  He drives a Honda-powered car for Team Mugen in the 2017 Super Formula Championship.  He will make his Formula One début at the 2017 Malaysian Grand Prix.

Toro Rosso STR2: The Toro Rosso STR2 is the car with which the Scuderia Toro Rosso team competed in the Formula One season.  It was unveiled on February 13, 2007 at the Circuit de Catalunya.  The car is, controversially, a variant of the Red Bull RB3 chassis (although powered by a Ferrari instead of a Renault engine).  It was initially driven by Vitantonio Liuzzi and Scott Speed, until Speed was replaced by Sebastian Vettel at the Hungaroring for the remainder of the season.  The car in a modified form was also used to compete in the first four races of the Formula One season.  The modified car was driven by Sébastien Bourdais, four-consecutive-time Champ Car winner, and Vettel.  The STR2 was the first-ever Toro Rosso F1 car to use the mandatory 90-degree Formula One V8 engine configuration but Toro Rosso opted for the 2006-spec Ferrari 056 instead of the 2007-spec because of 1-year old Toro Rosso engine policy and also cost reasons.

Toro Rosso STR6: The Toro Rosso STR6 is a Formula One racing car developed by Scuderia Toro Rosso for the 2011 Formula One season.  It is the second car that the team has built entirely on their own following the introduction of regulations that banned the use of "customer chassis", a chassis developed by one team and purchased by another (prior to 2010 Toro Rosso used a customer chassis from its "big brother" Red Bull Racing).

Jean-Éric Vergne: Jean-Éric Vergne (born 25 April 1990) is a French racing driver who competes in Formula E with Techeetah.  He competed in Formula One for Scuderia Toro Rosso from 2012 to 2014, and was a Ferrari test and development driver from 2015 to 2016.  He won the British Formula 3 Championship in 2010 and then finished runner up to team mate Robert Wickens in the 2011 Formula Renault 3.5 Series season.

Toro Rosso STR9: The Toro Rosso STR9 is a Formula One racing car designed by Scuderia Toro Rosso to compete in the 2014 Formula One season.  It was driven by Jean-Éric Vergne and 2013 GP3 Series champion Daniil Kvyat, who replaced Daniel Ricciardo after Ricciardo moved to Red Bull Racing.  The STR9 was the first Toro Rosso car to use an engine built by Renault, the Energy F1-2014.

Toro Rosso STR8: The Toro Rosso STR8 (initially referred to as the Toro Rosso STR08) is a Formula One racing car designed and built by Scuderia Toro Rosso for use in the 2013 Formula One season.  It was driven by Daniel Ricciardo and Jean-Éric Vergne, both of whom drove for the team in 2012.  This is the last Toro Rosso car for the engine to be named as Ferrari that have powered the team since 2007 despite opted for one-year old engine, before they could used Renault engine for 2014 Formula One season.  This was also the last Toro Rosso car to be used V8 engine, before replaced V6 engine for 2014.

Supporting paragraphs: Toro Rosso STR12 Pierre Gasly
Answer: Pierre Gasly