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Cholecystokinin (CCK) is a hormone which plays a key role in the digestion process. It is produced in the small intestine, especially in response to the presence of fats and proteins. The main functions of CCK are to stimulate the release of pancreatic enzymes and bile, and to cause the gallbladder to contract and release stored bile.

We will now evaluate each answer choice based on the information from Step 1. a. Bile production: CCK does not primarily stimulate bile production; it stimulates the release of bile and the contraction of the gallbladder. Therefore, this answer is incorrect. b. Release of pancreatic enzymes: CCK indeed stimulates the release of pancreatic enzymes, which help break down fats and proteins. This answer choice is correct. c. Contraction of the gallbladder: CCK stimulates gallbladder contraction, which releases stored bile into the small intestine. This answer choice is also correct. d. Both a and b: Since CCK does not stimulate bile production and this choice includes bile production, this choice is incorrect. e. Both b and c: This choice includes both the release of pancreatic enzymes and the contraction of the gallbladder, which are the primary functions of CCK. Therefore, this choice is correct.

Based on the evaluation in Step 2, the correct answer is: e. Both b and c - As the primary functions of Cholecystokinin (CCK) include stimulating the release of pancreatic enzymes and causing the contraction of the gallbladder.