<prompt> A patient using a contact lens develops a corneal infection. Laboratory diagnosis of acanthamoeba keratitis was established. The following is the best drug for treatmentPropamidineNeosporineKetoconazolePolyhexamethylene biguanide  <response>: PHMD is the drug of choice. Chlorhexidene is an alternativeTreatment with PHMB or chlorhexidene is often combined with propamidine and neomycine. Infections of eye 