(A) Disinfectants kill microorganisms but are harmful to the human tissues.
(R ) Thymol is a powerful disinfectant.

Which of the following statement (s) are true? I. Antibiotics can kill bacteria, but disinfectants do not II. Disinfectants have better bactericidal efficiency than antibiotics III. Antibiotics are of microbial origin, but disinfectant are chemical compounds IV. Antibiotics can be injected into the patients, whereas disinfectants are not.

Antiseptics and disinfectants kill microbes or prevent their growth. Which one of the following statements related to them is not true-