Question: Which drink contains strictly alcohol, a Bronx Cocktail or a Boilermaker?

Context paragraphs:
Alcohol powder: Alcohol powder or powdered alcohol or dry alcohol is a product generally made using micro-encapsulation.  When reconstituted with water, alcohol (also known formally as ethanol) in powder form becomes an alcoholic drink.  In March 2015 four product labels for specific powdered alcohol products were approved by the United States Alcohol and Tobacco Tax and Trade Bureau (TTB) which opened the doors for legal product sales.  However, as of January 4, 2016, the product is not yet available for sale and legalization remains controversial due to public-health and other concerns.  Researchers have expressed concern that, should the product go into production, increases in alcohol misuse, abuse, and associated physical harm to its consumers could occur above what has been historically associated with liquid alcohol alone.

Kahlúa: Kahlúa is a coffee-flavored liqueur from Mexico.  The drink contains rum, sugar, vanilla bean, and Arabica coffee.

Standard drink: A standard drink is a measure of alcohol consumption representing a hypothetical beverage which contains a fixed amount of pure alcohol.  A standard drink varies in volume depending on the alcohol concentration of the beverage (for example, a standard drink of spirits takes up much less space than a standard drink of beer), but it always contains the same amount of alcohol and therefore produces the same amount of drunkenness.

Egg cream: An egg cream is a beverage consisting of milk, carbonated water, and flavored syrup (typically chocolate or vanilla).  The drink contains neither eggs nor cream.

Drink mixer: Drink mixers are the non-alcoholic ingredients in mixed drinks and cocktails.  There are many reasons mixers are used.  They change or enhance flavors or add new ones to a drink.  Mixers dilute the drink, lowering the alcohol by volume in the drink.  They may make the drink sweeter, more sour, or more savory.  Some mixers change the texture or consistency of the drink, making it thicker or more watery.  Drink mixers may also be used strictly for decorative purposes by changing the color or appearance of the drink.

Boilermaker (beer cocktail): A boilermaker can refer to two types of beer cocktail.  In American terminology, the drink consists of a glass of beer and a shot of whiskey.  The beer is either served as a chaser or mixed with the whiskey.  The combination of a shot and beer produce a faster onset of the inebriating effects of alcohol.  When the beer is served as a chaser, the drink is often called simply a shot and a beer.  In Philadelphia, it is commonly referred to as a Citywide Special, often combining an inexpensive beer with an inexpensive whiskey.

Bronx (cocktail): The Bronx Cocktail is essentially a Perfect Martini with orange juice added.  It was ranked number three in "The World's 10 Most Famous Cocktails in 1934", making it a very popular rival to the Martini (#1) and the Manhattan (#2).  Today, it remains a popular choice in some markets, and was formerly designated as an Official Cocktail by the International Bartender Association.  Like the Manhattan, the Bronx is one of five cocktails named for one of New York City's five boroughs, but is perhaps most closely related to the Queens, which substitutes pineapple for the Bronx's orange.

Hand Grenade (cocktail): The specialty cocktail drink known as the Hand Grenade is sold frozen or on-the-rocks exclusively by 721 Bourbon, Inc. through five licensed nightclub bars in the New Orleans French Quarter.  Pam Fortner and Earl Bernhardt, owners of the Tropical Isle bar founded during the 1984 Louisiana World Exposition, created the melon-flavored Hand Grenade as their signature cocktail.  Since 1987, the federally registered trademark "Hand Grenade" has been used to uniquely identify the cocktail and its packaging.  Since January 1992, the Hand Grenade has been served in a green, translucent, plastic yard glass container with a bulbous, textured base shaped like an oversized hand grenade.  The grenade has anthropomorphic features, including black oval eyes and an upturned smile.  Printed in bold, black lettering, the legend extends vertically down the neck, with the cocktail name and a reference to its high alcohol content: "Hand Grenade® New Orleans Most Powerful Drink".  Consumers purchasing Hand Grenade cocktails in these containers receive discounts on refills at the licensed establishments.  In January 2012, a lower-calorie "Skinny Hand Grenade" was announced.

Layered drink: A layered (or "stacked") drink, sometimes called a pousse-café, is a kind of cocktail in which the slightly different densities of various liqueurs are used to create an array of colored layers, typically two to seven.  The specific gravity of the liquid ingredients increases from top to bottom.  Liqueurs with the most dissolved sugar and the least alcohol are densest and are put at the bottom.  These include fruit juices and cream liqueurs.  Those with the least water and the most alcohol, such as rum with 75% alcohol by volume, are floated on top.

Backdraft (drink): The Backdraft is a cocktail that is noted for its elaborate preparation and potency.  Named after the backdraft which occurs in some fire situations, this drink produces a similar condition on purpose using flammable alcoholic drinks and an enclosing container, such as an upside down pint glass.  Below is a typical procedure for producing one variation of the Backdraft drink.  The combination of warm alcohol, followed by inhaling vaporized alcohol, and then finishing with a highly spiced warm alcohol, makes the drinking of this drink difficult, and while it tends not to have an immediate effect (since it is drunk quickly), the warmth of the alcohol and the vapor, make the concentration and absorption of alcohol into the bloodstream quicker than other drinks, and produces a more profound impact .

Supporting paragraphs: Bronx (cocktail) Boilermaker (beer cocktail)
Answer: boilermaker