Passage Summary: A doctor argues that a specific study on kids with hormone deficiencies should be banned because research must be both very useful and very safe.

Conclusion: The proposed medical study involving children and synthetic growth hormones should be stopped.

Reasoning: Medical research is only ethical if it is likely to provide significant new medical knowledge and presents very little danger to the participants.

Analysis: To justify the physician's conclusion, we need to bridge the gap between the general rule and this specific study. The physician provides two criteria for 'permissible' research: it must be important and it must be low-risk. To conclude the study should be prohibited, we need evidence that it fails at least one of these tests. Look for an answer choice that states the study is either unlikely to reveal new info or that it carries more than a minimal risk to the children. Strengthening this argument requires confirming that the study violates the doctor's ethical standards.