The correct answer is B) Orthostatic Hypotension. MAOIS actually may often cause weight gain for patients and not weight loss. Gum hypertrophy is a side effect related to several medications including phenytoin but not MAOIs.

Publication reference : The Effects of Newer Antidepressants on Occupational Impairment in Major Depressive Disorder: A Systematic Review and Meta-Analysis of Randomized Controlled Trials.
Reference URL: https://www.ncbi.nlm.nih.gov/pubmed/27113464