单项选择题

A．Registry of drug trials is of no use.B．We should make……

What is Caplan' s opinion in the last paragraph

A．Registry of drug trials is of no use.
B．We should make demands on new drugs besides registering drug trials.
C．To put requirements on new drugs is much more effective than registering drug trials.
D．A new drug must be safe and better than any other drugs already on the market.

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