Question

which is true of how stds are transmitted?
stds can only be transmitted by a person who shows symptoms.
if a person is regularly tested, they cannot transmit an std.
stds are transmitted only through vaginal or anal sex.
each std has its own methods of transmission

Explanation:

• Option A is incorrect because some people with STDs may be asymptomatic but still contagious.
• Option B is wrong as regular testing doesn't guarantee no transmission (e.g., false - negatives, new infections between tests).
• Option C is inaccurate as STDs can also be transmitted through oral sex, sharing needles (for some like HIV), and from mother to child (e.g., syphilis).
• Option D is correct. For example, HIV can be transmitted through blood, semen, etc.; syphilis can be transmitted through direct contact with a syphilitic sore; and HPV (a common STD) is mainly transmitted through skin - to - skin contact in the genital area. Each STD has its specific ways of transmission based on its pathogen and biological characteristics.

Answer:

D. Each STD has its own methods of transmission