A 23-year-old man visited a community clinic after receiving notification from the health department that a previous sexual partner was diagnosed with a sexually transmitted disease. Although he does not recall having any ulcers, he currently has a macular rash on his trunk, arms, hands, and feet. He is tested for evidence of:

the answer for your question is b.

with the development of the times, more and more chemical reagents or drugs (such as ox bile/bile extract powder (ox bile desiccated), dried or desiccated which contains ox bile acids. this powder is specifically been developed for pharmaceutical industry. for more information: ) for the pharmaceutical industry use, its supervision can not be ignored.