Patients on MAO inhibitors must avoid foods rich in tyramine because:

Correct option is C

Tyramine escapes breakdown when MAO is inhibited → displaces norepinephrine → hypertensive crisis (“cheese reaction”).
Explanation of options: (a) ✘ Tyramine has no effect on blood glucose. (b) ✘ Serotonin syndrome occurs with SSRI + MAOI, not just tyramine. (c) ✔ Correct; tyramine → norepinephrine release → severe hypertension. (d) ✘ Tyramine is metabolized by MAO, not dopamine breakdown inhibitor.