Second generation anti-histaminics used in allergic rhinitis are
**Core Concept**
Second-generation antihistamines are a class of medications used to treat allergic rhinitis, characterized by their selective peripheral H1 receptor antagonism, reducing histamine-mediated symptoms without significant central nervous system penetration.
**Why the Correct Answer is Right**
The correct answer is likely a second-generation antihistamine such as loratadine, cetirizine, or fexofenadine, which are commonly used in allergic rhinitis due to their efficacy in alleviating symptoms like sneezing, itching, and nasal discharge. These medications work by blocking the action of histamine at the H1 receptor, a key mediator in allergic responses.
**Why Each Wrong Option is Incorrect**
**Option A:** Incorrect because first-generation antihistamines, such as diphenhydramine, are not the preferred choice for allergic rhinitis due to their sedative effects.
**Option B:** Incorrect as it might represent a different class of medication or a first-generation antihistamine.
**Option C:** Incorrect for similar reasons as Option B, possibly representing another class of drugs or an incorrect second-generation antihistamine.
**Clinical Pearl / High-Yield Fact**
Second-generation antihistamines are preferred over first-generation due to their non-sedating properties, allowing patients to maintain their daily activities without drowsiness.
**Correct Answer:** D. Second generation antihistamines like loratadine.