Step 1: Recall the daily output figures for the major gastrointestinal secretions, since these are frequently tested together.
Step 2: The pancreas contributes an isotonic, bicarbonate-rich, enzyme-laden juice. Its typical daily quantity is in the order of one and a half litres.
Step 3: Eliminate the implausible options. Five litres and ten litres would exceed the combined output of all the digestive glands together, so they cannot represent pancreatic juice alone. Two and a half litres is closer to the gastric output rather than the pancreatic one.
Step 4: That leaves 1.5 litres as the value matching pancreatic secretion.
\[\boxed{1.5 \text{ L}}\]