AI-generated practice question — model-generated for extra practice, not a previous-year CBSE board question.
Answer: C
A is false because ISI certification is NOT mandatory for all producers. R is true — certification is compulsory only for goods affecting health, safety, or mass consumption like LPG cylinders, cement, and packaged drinking water.
The textbook clearly states: "it is not compulsory for all the producers to follow standards. However, for some products that affect health and safety... it is mandatory." So the Assertion is false, and the Reason correctly explains the actual rule. Option C is correct.