A patient 57 year old male had a surgical intervention to make Billroth II because he had a peptic ulcer for about 10 years. But recently he had abdominal pain and his diagnosis was a recurrent ulcer. Now what can we do to distinguish that this is secondary to the intervention or to a gastrinoma.

What will be the best test to differentiate this situation?

a. The level of gastrin
b. The level of the acid production in 24 hours
c. The level of calcium in serum
d. The level of secretin in serum

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