Each schedule of the Drugs and Cosmetics Rules covers a distinct regulatory subject: Schedule L covers testing laboratories, Schedule C covers biological products like vaccines and sera, and Schedule H covers prescription-only drugs. The schedule that specifically lists diseases a drug's label or advertisement must not claim to cure or prevent is Schedule J. So the answer is J.
We can also work this out by process of elimination, recalling one concrete fact about each schedule listed.
Ruling out the laboratory, biological-product, and prescription schedules leaves only the one governing disease claims.
Therefore, the correct answer is J.