单项选择题

The passage supplies information to answer which of the following questions

A.Whichspecies,humanordog,hasgreaternumbersoftheneurotransmittersthathavebeenhypotheticallylinkedtonarcolepsy
B.Atwhatagedohumanbeingsfirstexperiencethedegenerativeeffectsofnarcolepsy
C.Whatroledohumanleukocyteantigensperformforthehumanimmunesystem
D.WhydidHondainitiallysuspectthatHLAsplayedaroleinnarcolepsy
E.Whichoftheresearchersnamedinthepassageisolatednarcolepsyasadistinctsyndrome