That would be the conductor.
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It depends on several things. What type of orchestra? In a jazz orchestra, it's usually 4 but there are sometimes 5. In a symphony orchestra, on any given song it can be as few as 0 or 1 or 2, or as many as 10 or more. Some songs have no brass parts, some call for 1 or 2 trumpets, some call for 8 or 10. Symphony orchestra usually have 3 or 4 "regular" trumpet players, and then they have alternates that they call when needed.
A symphony is literally a sonata for an orchestra. Sonatas are generally long pieces of classical music that are meant to be played by a soloist such as a pianist or violinist. A symphony is the same thing, but a whole orchestra plays the music.
conductor
conductor
The clarinet, and sometimes the bass clarinet. On rare occasion, some pieces call for a saxophone.