<human>: Does the sentence "The bipolar junction transistor, the first type of transistor to be mass-produced, is a combination of two junction diodes, and is formed of either a thin layer of p-type semiconductor sandwiched between two n-type semiconductors (an n–p–n transistor), or a thin layer of n-type semiconductor sandwiched between two p-type semiconductors (a p–n–p transistor)." answer the question "What is the name for a layer of n-type semiconductor set between two p-type semiconductors?"

OPTIONS:
- yes
- no
<bot>: yes