Explanations:The question asks about the city in East India where trams are still in use. Trams, also known as streetcars or trolley cars, are a form of rail transport that runs on fixed rails and are typically used for urban public transportation. They are a relic of the early 20th century and are now mostly found in a few cities around the world, often as a historical attraction or as part of a city's public transportation system.
In the context of East India, Kolkata stands out as the city where trams are still operational. Kolkata's tram system is one of the oldest in Asia, dating back to 1873. The trams in Kolkata are not just a means of transportation but also a significant part of the city's cultural and historical heritage. They are often referred to as "Kolkata's lifeline" and are a popular tourist attraction, offering visitors a unique way to experience the city's charm and history.
The other cities mentioned in the options do not have operational tram systems. Ranchi, the capital of Jharkhand, Patna, the capital of Bihar, and Gangtok, the capital of Sikkim, all rely on more modern forms of public transportation such as buses, auto-rickshaws, and taxis. These cities have not preserved or maintained a tram system as part of their public transportation infrastructure.
Understanding the historical context and the unique features of each city's transportation system is crucial for answering such questions correctly. Kolkata's tram system is a distinctive feature that sets it apart from other major cities in East India, making it the correct answer to this question.