Question: An example of a Assault rifle is what?

Context paragraphs:
Sterling SAR-87: The Sterling SAR-87 is a military assault rifle of the late Twentieth century.  The Sterling Assault Rifle (SAR), which included elements from Sterling's earlier Light Automatic Rifle (LAR) design, was jointly engineered by Sterling Armaments Company and Chartered Industries of Singapore in the early 1980s as an advanced version of the AR-18 for the export sales.  It was also offered to the British Armed Forces, who declined it because they were already in the process of adopting the SA80 bullpup design manufactured by Royal Ordnance Factories.  The SAR-87 was a robust weapon based on the well tried AR-18 with the versatility of the M16 rifle.  It could also be converted from 5.56×45mm NATO to 9×19mm Parabellum by changing the barrel and bolt assembly, to provide a submachine gun for Police forces.  Sterling Armaments tried to push the rifle, renamed SAR-87, for some more years, but at the end of the 1980s, it was bought out by British Aerospace/Royal Ordnance and closed.  Less than 100 SAR-87 rifles were manufactured.

Zastava M90: The Zastava M90 was an assault rifle developed and produced by Zastava Arms in SR Serbia, SFR Yugoslavia.  It was developed from the famous Zastava M70 assault rifle, the modified copy of the Soviet AKM assault rifle, but with a Western type flash eliminator added on the barrel end, chambered in also Western, 5.56×45mm NATO caliber, and with that a different magazine design, similar to Western STANAG magazine

Assault rifle: An assault rifle is a selective-fire rifle that uses an intermediate cartridge and a detachable magazine.  Assault rifles were first used during World War II.  Though Western nations were slow to accept the assault rifle concept, by the end of the 20th century they had become the standard weapon in most of the world's armies, replacing full-powered rifles and sub-machine guns in most roles.  Examples include the StG 44, AK-47 and the M16 rifle.

Excalibur rifle: Excalibur is an assault rifle that is derived from the INSAS rifle, which is the standard rifle of the Indian Army.  The rifle has many improvements over the INSAS rifle and was slated to replace the INSAS as the Indian Army's standard assault rifle, however the Indian Army put the replacement out to tender in September 2016.  The Excalibur will be manufactured by the Ordnance Factories Board in Ordnance Factory Tiruchirappalli, Small Arms Factory, Kanpur and Ichapore Arsenal.

VB Berapi LP06: The VB Berapi LP06 is the first assault rifle designed and manufactured by Malaysia, and is not related to any previously licensed assault rifles made by VB Berapi.  The LP06 is a bullpup assault rifle.  It is chambered in the 5.56×45mm NATO round and is fed from a 30-round magazine.  Hisham Abd Majid, the director of Vita Berapi in 2006, said that the rifle is designed by Viktor Prykhodko (Russian: Виктор Приходько), a Russian residing in Malaysia.

StG 44: The StG 44 (abbreviation of Sturmgewehr 44, "assault rifle 44") is a German selective-fire rifle developed during World War II.  It is also known under the designations MP 43 and MP 44 ("Maschinenpistole 43", "Maschinenpistole 44" respectively).

Vektor CR-21: The Vektor CR-21 is a prototype South African assault rifle ("CR-21" being an abbreviation of Combat Rifle 21st Century) chambered for 5.56×45mm NATO ammunition.  It was designed by Denel Land Systems as a possible replacement for the South African National Defence Force's current R4 assault rifle, however Denel Land Systems has since shifted focus to offering an upgraded R4 assault rifle to the SANDF instead.

T86 assault rifle: The T86 (聯勤 Type 86) assault rifle is a gas-operated, magazine-fed, air-cooled assault rifle.  It is the second original rifle design conducted by the 205th Armory of Combined Service Forces, Republic of China (Taiwan).  Though it saw limited production and service after a protracted development process, it became the basis of the T91 Assault Rifle currently in volume production for the ROC armed forces.

Howa Type 89: The Howa Type 89 Assault Rifle (89式小銃 , howa-hachi-kyū-shiki-syōjū ) , referred to as the "type 89 5.56mm rifle" (89式5.56mm小銃 , hachi-kyū-shiki-go-ten-go-roku-miri-syōjū ) , is a Japanese assault rifle used by the Japan Self-Defense Forces, the Japan Coast Guard's Special Security Team units, and the Special Assault Team.  It was never exported outside Japan due to its strict anti-hardware export policy.  It is known in JGSDF service as Buddy.

KH-2002: The KH2002 "Khaybar" is an Iranian-designed assault rifle, derived from the DIO S 5.56 assault rifle and further developed by Iran's Defense Industries Organization (DIO).  It was designed in 2001 with samples produced in 2003 with the eventual production of the KH2002 commencing in 2004.  It is similar in appearance to the FAMAS assault rifle.

Supporting paragraphs: Assault rifle StG 44
Answer: StG 44