Question: What s a popular French cocktail made with a measure of crème de cassis topped up with white wine, El Presidente or Kir?

Context paragraphs:
Golden Cadillac: The Golden Cadillac is a cocktail made with Galliano, white crème de cacao, and cream.  It is classified as an "after-dinner" drink, a digestif.  This cocktail originated at Poor Red's BBQ in the town of El Dorado, California.

Crème de cassis: Crème de cassis (] ) (also known as Cassis Liqueur) is a sweet, dark red liqueur made from blackcurrants.

Crème liqueur: A crème liqueur (not to be confused with cream liqueur) is a liqueur that has a great deal of additional sugar added to the point that it has a near-syrup consistency.  Unlike cream liqueurs, crème liqueurs include no cream in their ingredients.  "Crème" in this case refers to the consistency.  This category includes crème de cacao (chocolate), crème de menthe (mint), crème de mûre (blackberry), and crème de cassis (black currant).

Kir (cocktail): Kir is a popular French cocktail made with a measure of crème de cassis (blackcurrant liqueur) topped up with white wine.

El Presidente (cocktail): The El Presidente is a mix of rum, curaçao, vermouth, and grenadine.

Aviation (cocktail): The Aviation is a classic cocktail made with gin, maraschino liqueur, crème de violette, and lemon juice.  Some recipes omit the crème de violette.  It is served straight up, in a cocktail glass.

Kir Royal: Kir Royal is a French cocktail, a variation on Kir.  It consists of crème de cassis topped with champagne, rather than the white wine used in traditional Kir.  The apéritif is typically served in a flute glass.

El Presidente (album): El Presidente is the self-titled debut album from Scottish band El Presidente, released 24 October 2005.  The album was also released on 8 February 2006 in Japan with two extra tracks, a new recording called "Lies" and a cover of Prince's "Raspberry Beret", which was also included as a B-side to "Turn This Thing Around".  In total four singles have been released from the album, "Rocket", "100 MPH", "Without You" and "Turn This Thing Around".

100 MPH: "100 MPH" is a song by El Presidente from their debut album "El Presidente" (2005).  It was released as a single on two formats, CD and Yellow 7".  It reached number 37 in the UK Singles Chart, although in the midweek chart it was at number 34.

Skin-contact wine: Skin-contact wine, amber wine, or orange wine is a type of wine made from white wine grapes where the grape skins are not removed, and stay in contact with the juice for days or even months.  This contrasts with conventional white wine production, which involves crushing the grapes and quickly moving the juice off the skins into the fermentation vessel.  The skins contain color pigment, phenols and tannins that would normally be considered undesirable for white wines, while for red wines skin contact and maceration is a vital part of the winemaking process that gives red wine its color, flavor, and texture.  This style of wines can also be known by their colour references of having an amber or orange tinge that the base white wine receives due to its contact with the coloring pigments of the grape skins.

Supporting paragraphs: El Presidente (cocktail) Kir (cocktail)
Answer: Kir