I think the answer might be D
Answer:
Lesion Sterilization and Tissue Repair
Technology, IT etc (4) LSTR — Lesion Sterilization and Tissue Repair. LSTR — Listener Sidetone Rating. LSTR — Listener Side Tone Rating. LSTR — Lesion Sterilization and Tissue Regeneration.
Explanation:
Honestly i think that it is b i hope i helped