Choose the most appropriate word from the options given below to complete the following sentence: Under ethical guidelines recently adopted by the Indian Medical Association, human genes are to be manipulated only to correct diseases for which ______ treatments are unsatisfactory.
Options:
(A) similar
(B) most
(C) uncommon
(D) available
Official Answer Key:
D
Step-by-Step Solution & Explanation
The sentence contrasts gene manipulation (a drastic, last-resort measure) with conventional treatment. It makes sense only if conventional treatments 'available' for the disease are unsatisfactory — gene therapy is used when existing/available treatment options don't work well. 'Available' (D) fits this logic naturally; the other options (similar, most, uncommon) don't produce a coherent contrast.
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