title: Classical guitar
context: The classical guitar (also known as the nylon-string guitar or Spanish guitar) is a member of the guitar family used in classical music. It is an acoustic wooden string instrument made of gut or nylon, precursor of the acoustic and electric guitars which use metal strings. Classical guitars are derived from the Spanish vihuela and gittern in the fifteenth and sixteenth century, which later evolved into the seventeenth and eighteenth century Baroque guitar and later the modern classical guitar in the mid nineteenth century.
question: What's the difference between an acoustic guitar and a classical?
answers.text: strings