Answer:
a. True.
Explanation:
Syphilis is a sexually transmitted disease or venereal disease. The infection is caused by the bacterium Treponema pallidum.
The syphilis is diagnosed by antibody test (serology). This test includes detecting of antibodies which are produced by lymphocytes in response to infection caused by Treponema pallidum in the blood.
Thus, the given statement is true.
