Final answer:
The lowest woodwind instrument in the orchestra is the contrabassoon, also known as the double bassoon.
Step-by-step explanation:
In an orchestra, the lowest woodwind instrument is the contrabassoon, also known as the double bassoon. It is larger and produces lower-pitched sounds compared to other woodwind instruments like the piccolo flute. The tuba, mentioned in the options, is actually a brass instrument and not a woodwind instrument.