Step 1: Miasm theory divides chronic diseases into Psora, Syphilis, Sycosis.
Step 2: Syphilitic miasm causes ulceration, tissue breakdown, bone deformities — purely destructive.
Step 3: Psora affects function. Sycosis causes overgrowths. Tubercular is mixed but Syphilis is purely destructive.
So, the correct answer is (B) Syphilis.