Multiple choice Which of the following is correct pair of disease and its causing agent? Food poisoning-Brevibacillus brevis Gonorrhoea-Entamoeba Syphilis-Treponema pallidum Urethritis-Bacillus anthracis Reveal answer Fill a bubble to check yourself C Correct answer Explanation Syphilis is a sexually transmitted disease caused by Treponema pallidum. The incubation period of this pathogen varies form 10 to 90 days (average one month).