​Silver revolution is concerned with: ​

Correct option is B

The correct answer is (B) Egg.

Explanation:
The Silver Revolution is primarily related to the increase in egg production in India, much like the Green Revolution (for food grains) and the White Revolution (for milk).

Incorrect Options Explanations:

• Metal: Incorrect, the term "Silver" is used metaphorically, not related to actual silver metal.
• Milk: Incorrect, milk is associated with the White Revolution, not the Silver Revolution.
• Agriculture: Incorrect, Silver Revolution specifically pertains to egg production, not broad agriculture.

Information Booster:

• Silver Revolution: Focused on the expansion of poultry farming in India, especially for eggs.
• Key Contributors: Organizations like National Egg Coordination Committee (NECC) played a vital role.