Which one of the following subjects is under the Union List in the Seventh Schedule of the Constitution of India?

Option 1 is correct. Regulation of labour and safety in mines and oilfields is a subject assigned to the Union List, whereas agriculture, fisheries and public health are specifically listed under the State List. The Seventh Schedule distinguishes subjects for exclusive Union and State legislation; items such as public health and sanitation, agriculture and fisheries are examples of State List entries [1]. The Union List contains numerous central subjects over which Parliament has exclusive power; the Schedule enumerates these entries and assigns residuary powers to the Centre [2]. Therefore, among the given choices only the regulation of labour and safety in mines and oilfields falls under the Union List.

Sources

1. [1] Introduction to the Constitution of India, D. D. Basu (26th ed.). > Chapter 24: DISTRIBUTION OF LEGISLATIVE AND EXECUTIVE POWERS > CHAP. 24] DISTRIBUTION OF LEGISLATIVE AND EXECUTIVE POWERS 377 > p. 377
2. [2] Laxmikanth, M. Indian Polity. 7th ed., McGraw Hill. > Chapter 14: Federal System > III Division of Powers > p. 139