Problem:Context: "Let It Go" is a song from Disney's 2013 animated feature film Frozen, whose music and lyrics were composed by husband-and-wife songwriting team Kristen Anderson-Lopez and Robert Lopez. The song was performed in its original show-tune version in the film by American actress and singer Idina Menzel in her vocal role as Queen Elsa. Anderson-Lopez and Lopez also composed a simplified pop version (with shorter lyrics and background chorus) which was performed by actress and singer Demi Lovato over the start of the film's closing credits. A music video was separately released for the pop version.

Question: who sings let it go in the frozen movie?
Solution:OK... To answer the question, consider the following: The song was performed in its original show-tune version in the film by American actress and singer Idina Menzel in her vocal role as Queen Elsa.
American actress and singer Idina Menzel.

Problem:Context: Warrant Officer of the Air Force (WOFF-AF) is the most senior Warrant Officer in the Royal Australian Air Force (RAAF). It is a singular appointment -- it is only held by one person at any time. The special insignia for the WOFF-AF is the Australian coat of arms with a wreath around it. The current Warrant Officer of the Air Force is Robert Swanwick.

Question: what is a warrant officer in air force?
Solution:OK... To answer the question, consider the following: Warrant Officer of the Air Force (WOFF-AF) is the most senior Warrant Officer in the Royal Australian Air Force (RAAF).
the most senior Warrant Officer in the Royal Australian Air Force ( RAAF ).

Problem:Passage: Near-field communication (NFC) is a set of communication protocols that enable two electronic devices, one of which is usually a portable device such as a smartphone, to establish communication by bringing them within 4 cm (1.6 in) of each other.

Question: Based on this passage, what is the meaning of near field communication?
Solution:
OK... To answer the above question, the relevant sentence is: Near-field communication (NFC) is a set of communication protocols that enable two electronic devices, one of which is usually a portable device such as a smartphone, to establish communication by bringing them within 4 cm (1.6 in) of each other.
a set of communication protocols that enable two electronic devices , one of which is usually a portable device such as a smartphone , to establish communication by bringing them within 4 cm ( 1.6 in ) of each other.