Answer:
Option B, anorexia
Step-by-step explanation:
Methylphenidate, also known by brand name Concerta, is a central nervous system (CNS) stimulant medication indicated for the treatment of attention-deficit/hyperactivity disorder (ADHD) as well as narcolepsy. By stimulating both the CNS and the respiratory system, the medication can increase attention span, alertness, and motor activity thereby improving the focus of those with ADHD.
However, like most if not all medications, it comes with side effects -- namely, anorexia. This is not to be confused with the condition anorexia nervosa, which is an eating disorder where the patient restricts their food intake, exercises excessively, purges the food they do consume, etc. usually due to a fear of gaining weight or becoming overweight. Anorexia as a symptom is a term that simply means that the patient experiences a loss of appetite. With increased focus, patients often do not feel hungry and will not eat until the medication wears off, which can lead to other symptoms, like fatigue, headaches, and dizziness.
Because the patients often experience anorexia and their metabolism increases as a result of CNS stimulation, weight loss (not gain) is a common occurrence. Agitation and depression are not marked side effects or adverse reactions and, if present, should investigated for the underlying causes; they, in fact, may be symptoms that the medication is ineffective.
Though it can be an issue, the patient reporting a decrease or loss in appetite, known as anorexia, is a sign the methylphenidate is effective.