In which place of Himachal Pradesh, an army regiment was set up in 1842 by British General Gilbert?

The correct answer is: C. Subathu

Subathu is a cantonment town in Solan district of Himachal Pradesh, India. It is located 18 km from Solan and 25 km from Shimla. The town was founded in 1842 by British General Gilbert as a military cantonment. It is home to the 13th Battalion of the Sikh Regiment of the Indian Army.

The other options are incorrect because:

• Shimla is the capital of Himachal Pradesh. It is a popular tourist destination and was the summer capital of British India from 1864 to 1939.
• Dag-e-Shai is a village in the Chamba district of Himachal Pradesh. It is located on the banks of the Ravi River.
• Kasauli is a hill station in Solan district of Himachal Pradesh. It is located 25 km from Shimla.