A 45-year-old veteran is seen in the clinic because of poor impulse control. Over the past month he has spent all of his savings on business ventures and is currently estranged from his wife. He admits a decreased need for sleep,  a new sense of grandiosity, and increased energy spent on researching projects to make money. He has no prior psychiatric history, and his only medical history includes treatment for gonorrhea during his military service and an appendectomy at age 36 years. Physical examination reveals a thin, middle-age man withpressured speech. His pupillary examination is normal, except that the pupils are reactive to  convergence but not to light. Infection with which of the following organisms is the most likely etiology of his symptoms?

(A) Chlamydia trachomatis

(B) Herpes simplex virus

(C) Neisseria gonorrhoeae

(D) Toxoplasma

(E) Treponema pallidum