You are answering a USMLE-style medical question. Question: Eight weeks after starting a new weight-loss medication, a 43-year-old woman with obesity comes to the physician because of greasy diarrhea, excessive belching, and flatulence. She also complains of progressively worsening night-time vision. She has had no fever, chills, or vomiting. Physical examination shows dry, scaly skin on her extremities and face. Which of the following is the most likely mechanism of action of the drug she is taking? Options: A) Stimulation of monoamine neurotransmitter release B) Inhibition of serotonin reuptake C) Stimulation of norepinephrine release D) Inhibition of lipase Reply with ONLY the letter of the correct answer (A, B, C, or D). No explanation.