Correct Answer: Gaur (Bison)
Subject: 2025
Explanation: <b>Key Fact</b><br>The Gaur (Indian Bison) is the designated State Animal of Bihar (often officially designated as Bull/Gaur).<br><br><b>Additional Info</b><br>Topic: State Symbols of Bihar.<br><br><b>Why the other options are wrong</b><br>Option A: Correct.<br>Option B: Buffalo is not the state animal.<br>Option C: Cow is not a state symbol.<br>Option D: Nilgai is common in the plains but is not the official state animal.<br><br><b>Exam Trick</b><br>State Bird of Bihar = House Sparrow; State Animal = Gaur (Bull).<br><br><b>Final Answer</b><br>Option A — Gaur (Bison).