Pick a popular book title from the 20th century.
One popular book title from the 20th century is "To Kill a Mockingbird" by Harper Lee, published in 1960.
Complete the following task based on the instruction and optional input provided.### Instruction:
Pick a popular book title from the 20th century.

### Output:
One popular book title from the 20th century is "To Kill a Mockingbird" by Harper Lee, published in 1960.