Option 1 (Question):
* "Oh, it called the Piano Sonata No. 14?" (This is a question, so it needs a question mark.)
Option 2 (Statement):
* "Oh, it called the Piano Sonata No. 14." (This is a statement, so it needs a period.)
Option 3 (Exclamation):
* "Oh, it called the Piano Sonata No. 14!" (This is an exclamation, so it needs an exclamation mark.)
The best punctuation depends on the context and how you want to convey the sentiment.