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 be most likely to consult the

A) American Medical Association's Treatment Manual (AMA-TM) .
B) Diagnostic and Statistical Manual, fourth edition (DSM-IV-TR) .
C) International Classification of Mental and Behavioural Disorders (ICD-10) .
D) Diagnostic and Statistical Manual, sixth edition (DSM-VI) .
E) The North American Guide to Psychiatric Disorders (NAPD-IV) .