DmitryFarber wrote:
RuchitaB It would help to know what you found appealing about C, but this answer is what I typically call a Variation Trap. It brings in some source of variation/difference from one time/place/person/case to another to try to make us doubt the overall argument. However, we are told that less anesthesia is needed at night. So while the exact numbers may move back and forth a bit, the underlying fact remains that the night has this advantage. C doesn't give us anything to counteract this advantage, or any reason to suspect that operating at night would fail to achieve the stated goal, so it isn't a Weaken at all.
Sir, what I find appealing about ''C'' is that it says- a person's biological rhythm shifts- which may imply that the time of secretion of hormone might shift; consequently its effect might not be prominent at time of surgery.
But now I understand that the the words ''slightly'' and ''óver the course of year'' imply that the shift may be insignificant.
Also, we do not know whether the secretion of pain-blocking hormone is a biological rhythm.
Is that right??
Question :-
The human body secretes more pain-blocking hormones late at night than during the day. Consequently, surgical patients operated on at night need less anesthesia. Since larger amounts of anesthesia pose greater risks for patients, the risks of surgery could be reduced if operations routinely took place at night.
Which of the following, if true, argues most strongly against the view that surgical risks could be reduced by scheduling operations at night?
(C) Over the course of a year, people’s biological rhythms shift slightly in response to changes in the amounts of daylight to which the people are exposed.