Which of the following fluids cannot transmit hiv? a. tears b. semen c. blood d. vaginal fluid

HIV is highly communicable, however in order for it to infect someone exposure to bodily fluids that are considered more biological are able to pass it on. This includes primarily Blood, Semen, and Vaginal Discharge. Tears however which are normally there as a waste product, and because of the salt content mean it is not full of HIV.

The correct answer is A

 HIV can't be transmitted by shaking hands, using the same plate
It can only be transmitted by blood. So that means as well during sexual relations, because in the vagina , the "skin" is very thin and there are many blood vessels
By semen, if your partner has the HIV and doesn't use condom, he is a criminal if he didn't tell you anything, unless himself doesn't know.

That's why the use of condoms , even if a woman is under contraception, should be always used. If the relation last, each does the test, and if each is truly  respectful, you can stop using it

Among the youngest, there is again a higher number of HIV because there are less prevention than a few years ago

Ican only answer your first question, a machine is like a human body because it's a little similar. they both almost work like the same.