Parotid contrast sialography is necessary for clarification of the diagnosis of a 25-year-old patient. Where is the orifice located, through which a contrast medium can be introduced?

Answer options

1. On the caruncula sublingualis
2. On the cheek, opposite the upper second premolar
3. On the cheek, opposite the lower second molar
4. On the plica sublingualis
5. On the cheek, opposite the upper second molar