user
Instruction
Answer the question based on the provided table.


Table
Table Title: 'More than or equal to 20 million copies' regarding 'List of best-selling albums in the United States'
Table Content:
| Year | Artist | Album | Label | Shipments (Sales) | Certification |
| --- | --- | --- | --- | --- | --- |
| 1976 | Eagles | Their Greatest Hits (1971–1975) | Asylum | 38,000,000 | 38× Platinum |
| 1982 | Michael Jackson | Thriller | Epic | 33,000,000 | 33× Platinum |
| 1976 | Eagles | Hotel California | Asylum | 26,000,000 | 26× Platinum |
| 1971 | Led Zeppelin | Led Zeppelin IV | Atlantic | 23,000,000 | 23× Platinum |
| 1980 | AC/DC | Back in Black | Atlantic | 22,000,000 | 22× Platinum |
| 1977 | Fleetwood Mac | Rumours | Warner Bros. | 20,000,000 | 20× Platinum |


Question
What was the best-selling album in the U.S. before Michael Jackson's Thriller, and for how long did it hold this record?


Answer Format
The final answer should be a sentence and use the following format:
```json
{
    "answer": "your_generated_sentence_here"
}
```
rule
["Their Greatest Hits was the best-selling album in the United States, and it stayed the best-selling album in the U.S. for some years (1971–1975), until it was surpassed by Michael Jackson's Thriller."]