From OpenContent Curriculum
A pig is a device that is placed in the oil pipeline in order to accomplish certain types of important tasks. They can be used for inspection as well as for maintenance tasks. Many pigs have been used, some used up (worn out), during the service life of the pipeline.
A. Is the number of pigs in the Alaska Oil Pipeline.
B. It's the gestation period, in months, of the Ringed Seal.
C. Is the number of Regional Native Corporations which got both land and money.