An antipyretic is a drug used to reduce fever. These drugs work by acting on the hypothalamus to lower the body temperature. Examples include paracetamol (acetaminophen) and ibuprofen.
- Option (A): Antibiotics are used to treat bacterial infections and do not directly reduce fever.
- Option (C): Analgesics are pain relievers, which may or may not reduce fever.
- Option (D): Tranquilizers are used to reduce anxiety and do not affect body temperature.
Therefore, the correct answer is option (B).