The correct answer is: A. first hospital on wheels in the world
Jeevan Rekha (Life line) express is a hospital train that provides medical services to people in rural areas of India. It was launched in 1992 and is the first hospital on wheels in the world. The train has a team of doctors, nurses, and other medical staff who provide a range of services, including surgery, childbirth, and treatment for chronic diseases. The train also has a laboratory, pharmacy, and X-ray machine.
Option B is incorrect because the first railway express was the Liverpool and Manchester Railway, which opened in 1830.
Option C is incorrect because the oldest train in the world is the Darjeeling Himalayan Railway, which opened in 1881.
Option D is incorrect because Jeevan Rekha (Life line) express is a hospital train, not a regular train.