Skin S.T.D. 418668b2 Soft sore is caused by? A H ducreyi B Calymmatobacteriumgranulomatis C Chlamydia trachomitis D T. Pallidum High-Yield Explanation Ans. is "a' i.e., H ducrevi o Lesion of primary syphilis-Chancre (Hard - chancre).o Lesion of H. Ducreyi-Chancroid (Soft - chancre).