What two sti’s cannot be cured and can always be passed to someone else, even if you do not have symptoms

What is the answer to this particular question i have in health

Andrew loves to go camping and hiking in the fall. about two weeks after his last camping trip, he noticed an expanding red, target shaped, rash on his arm. to avoid this illness, andrew should have select one: a. boiled his water before drinking. b. avoided contact with ticks. c. avoided contact with fleas found on mice. d. camped only in the spring.

Which form of birth control good people use without altering hormonal systems are blocking sperm from fertilizing an egg