We can settle this by recalling what each schedule of the Drugs and Cosmetics Rules actually covers, and matching that to the description in the question.
- L: Schedule L specifies the requirements and conditions for the recognition and functioning of drug testing laboratories, an entirely different subject from disease claims.
- J: Schedule J lists specific diseases and ailments (such as cancer, blindness, and several others) that no drug or remedy may claim, in its labelling or advertising, to prevent or cure, precisely matching the question's description.
- C: Schedule C (and C1) lists biological and special products such as sera, vaccines, and hormone preparations, along with the special storage/testing conditions that apply to them, unrelated to disease-claim restrictions.
- H: Schedule H lists prescription-only drugs that must be sold strictly against a registered medical practitioner's prescription, a different regulatory concern from disease-claim restrictions.
Only one of these four schedules is specifically about restricting therapeutic claims for particular diseases, and that is Schedule J.
Therefore, the correct answer is J.