Step-by-step explanation:
The blank in the statement should be filled with "PNP" transistor.
A PNP transistor is formed by placing a slice of n-type germanium between two slices of p-type germanium. The sandwiched n-type region acts as the base, while the p-type regions serve as the emitter and collector of the transistor. PNP transistors are one of the common types of bipolar junction transistors (BJTs) and are widely used in electronic circuits for amplification, switching, and other applications.