Proteins are chemically digested using
A. HCl, pepsin, trypsin, and peptidases
B. HCl, gastrin, lipase, and peptidases
C. Secretin, HCl, amylase, and lipase
D. Serotonin, gastrin, histamine, and acetylcholine
E. Bile, amylase, pepsin, and trypsin
Answer: A. HCl, pepsin, trypsin, and peptidases
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