Question: Nexus 5X is an Android smartphone manufactured by  a South Korean multinational electronics company headquartered where?

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Nexus 6P: Nexus 6P (codenamed "Angler") is an Android smartphone developed and marketed by Google and manufactured by Huawei.  It succeeded the Nexus 6 as the flagship device of the Nexus line of Android devices by Google.  Officially unveiled on 29 September 2015 along with the Nexus 5X at the Google Nexus 2015 press event held in San Francisco, it was made available for pre-order on the same day in United States, United Kingdom, Ireland, and Japan.

Samsung Electronics: Samsung Electronics Co., Ltd. (Korean: 삼성전자; Hanja: 三星電子 (Literally "tristar electronics")) is a South Korean multinational electronics company headquartered in Suwon, South Korea.  Through extremely complicated ownership structure with some circular ownership, it is the flagship company of the Samsung Group, accounting for 70% of the group's revenue in 2012.  It is the world's second largest information technology company by revenue after Apple.  Samsung Electronics has assembly plants and sales networks in 80 countries and employs around 370,000 people.  Since 2012, Kwon Oh-hyun has served as the company's CEO.

Nexus 6: The Nexus 6 (codenamed Shamu) is a phablet co-developed by Google and Motorola Mobility that runs the Android operating system.  The successor to the Nexus 5, the device is the sixth smartphone in the Google Nexus series, a family of Android consumer devices marketed by Google and built by an original equipment manufacturer partner.  Nexus 6 along with HTC Nexus 9 served as the launch devices for Android 5.0 "Lollipop".

Nexus 5X: Nexus 5X (codenamed bullhead) is an Android smartphone manufactured by LG Electronics, co-developed with and marketed by Google Inc. as part of its Nexus line of flagship devices.  Unveiled on September 29, 2015, it is a successor to the Nexus 5.  Nexus 5X along with Nexus 6P served as launch devices for Android 6.0 Marshmallow, which introduced a refreshed interface, performance improvements, increased Google Now integration, and other new features.  It is currently one of the few phones that can connect to Project Fi (North American models only), along with the Nexus 6, Nexus 6P, and the Pixel.

Nexus One: The Nexus One (codenamed HTC Passion) is an Android smartphone designed and manufactured by HTC as Google's first Nexus smartphone.  The Nexus became available on January 5, 2010, and features the ability to transcribe voice to text, an additional microphone for dynamic noise suppression, and voice guided turn-by-turn navigation to drivers.

Nexus 5: Nexus 5 (codenamed Hammerhead) is an Android smartphone manufactured by LG Electronics for Google.  Co-developed with and marketed by Google Inc. as part of its Nexus line of flagship devices and unveiled on October 31, 2013, it is a successor to the Nexus 4.  Nexus 5 served as the launch device for Android 4.4 "KitKat", which introduced a refreshed interface, performance improvements, increased Google Now integration, better battery life and other features.

LG Electronics: LG Electronics Inc. ("Lucky Goldstar") (Korean: LG전자 ) is a South Korean multinational electronics company headquartered in Yeouido-dong, Seoul, South Korea, and is part of the LG Group, employing 82,000 people working in 119 local subsidiaries worldwide.  With 2014 global sales of USD 55.91 billion (KRW 59.04 trillion), LG comprises four business units: Home Entertainment, Mobile Communications, Home Appliance & Air Solution, and Vehicle Components, with Starion India as its main production vendor for refrigeration and washing machines in the Indian sub-continent.  The CEO of LG Electronics is Bon-joon Koo, who assumed the role of vice chairman of LG Electronics on 1 October 2010.

Galaxy Nexus: The Galaxy Nexus (GT-I9250) is a touchscreen Android smartphone co-developed by Google and Samsung Electronics.  It is the third smartphone in the Google Nexus series, a family of Android consumer devices built by an original equipment manufacturer partner.  The phone is the successor to Google's previous flagship phones, the Nexus One and Nexus S.

LG smartphone bootloop issues: Several smartphone models introduced by LG Electronics between 2015 and 2016 were discovered by users to have manufacturing defects, all of which eventually cause the devices to become unstable, and/or stuck in a loop of reboots attempting to boot, rendering them effectively inoperable—an issue that had been nicknamed a bootloop.  The LG G4 (2015) has been the most synonymous with these failures, with LG stating that the issues were the result of a "loose contact between components".  Similar issues have also been reported to a smaller extent with the G4's successors and sister models, including the Nexus 5X, LG V10 and LG G Flex 2.

Google Nexus: Google Nexus is a line of consumer electronic devices that run the Android operating system.  Google manages the design, development, marketing, and support of these devices, but some development and all manufacturing are carried out by partnering with original equipment manufacturers (OEMs).  s of 2016 , the devices currently available in the line are two smartphones, the Nexus 6P (made with Huawei) and Nexus 5X (made with LG).  The line has also included tablets and streaming media players, though neither type of device is currently available.  The most recent tablet was the Nexus 9 (made with HTC), and the most recent streaming media player the Nexus Player (made with Asus).

Supporting paragraphs: Nexus 5X LG Electronics
Answer: Yeouido-dong, Seoul, South Korea