Thukpa is a hearty Sikkimese dish consisting of:

The correct answer is: a) Noodle soup.

Thukpa is a hearty Sikkimese dish consisting of noodles, meat, vegetables, and spices in a broth. It is a popular dish in the Himalayan region and is often served as a main course.

Option b) Rice and lentils is incorrect because thukpa does not contain rice or lentils.

Option c) Stir-fried vegetables is incorrect because thukpa is a soup, not a stir-fry.

Option d) Sweet rice pudding is incorrect because thukpa is a savory dish, not a sweet dish.