instruction:
Given an trivia question precisely answer the question with a word/phrase/name. External resources such as Wikipedia could be used to obtain the facts.
question:
What note is produced at the twelfth fret of the top (highest pitched) string on a conventionally tuned guitar?
answer:
e


question:
What is the second letter of the Greek alphabet?
answer:
beta


question:
What internationally recognized unit of length (though not formally defined within the International System of Units (SI)) equal to 0.1 nanometre or 1 1010 metres is often used in the natural sciences for expressing the sizes of atoms, lengths of chemical bonds and the wavelengths of electromagnetic radiation, and in technology for the dimensions of parts of integrated circuits?
answer:

angstrom