user: Classify below into more useful and less useful minerals in our food: iron, calcium, magnesium, chloride, selenium, potassium, phosphorous,  zinc, iodine, mercury, copper.

assistant: In the given minerals, these are the minerals more useful to have in our foods: magnesium, sodium, calcium, phosphorous, chloride and potassium.
In the given minerals, these are the minerals less useful to have in our foods: iron, iodine, zinc, selenium, copper and mercury

user: When was the Memphis album released

assistant: Memphis is the seventeenth album recorded by Roy Orbison, and his tenth for MGM Records. The album was released in November 1972.

The album took three weeks to make in March and April 1972. The album had one single, "Memphis, Tennessee", which became a minor hit in the US, charting at #84. Also included was a new, re-recorded version of Don Gibson's "I Can't Stop Loving You", which previously appeared on his 1960 album "Lonely and Blue". This was Orbison's final album that was released for London Records as Decca let Orbison out of their contract on June 30, 1972.

user: Who won six consecutive Wimbledon titles in the 1980s

assistant: Martina Navratilova