Richard is a 36-year-old patient who is complaining of insomnia and weight loss. He tells you his heart often races. Richard's current weight is 126, and a star you notice that at his last visit three months ago, his weight was 142. He seems anxious while you are conducting the interview. For which of the following disorders might you expect the physician to test?

A) Hypothyroidism
B) Hyperthyroidism
C) Diabetes mellitus
D) Cushing's syndrome