Step 1: Understanding antiseptics.
Antiseptics are substances that prevent the growth of microorganisms and are used to clean wounds or surfaces. Penicillin, on the other hand, is an antibiotic used to treat bacterial infections, not an antiseptic.
Step 2: Analyzing the options.
(A) Bithional: This is an antiseptic used in soap and skin treatments.
(B) Penicillin: This is an antibiotic, not an antiseptic. It is used to treat bacterial infections inside the body, not as a topical antiseptic.
(C) Chloroxylenol: This is an antiseptic and disinfectant.
(D) Iodine: Iodine is a well-known antiseptic used in wound cleaning.
Step 3: Conclusion.
The correct answer is (B) Penicillin.