Your Housemate Has Been Overly Concerned with Keeping the Kitchen

Your housemate has been overly concerned with keeping the kitchen clean. In fact, he scrubs the sinks and counters for half an hour each time someone puts something on them. In order to determine his diagnosis, a practitioner in North America would most likely consult the

A) American Medical Association's Treatment Manual (AMA-TM) .
B) Diagnostic and Statistical Manual of Mental Disorders, fifth edition (DSM-5)
C) International Statistical Classification of Diseases and Related Health Problems (ICD-10) .
D) Diagnostic and Statistical Manual of Mental Disorders, sixth edition (DSM-6) .
E) The North American Guide to Psychiatric Disorders (NAPD-IV) .