According to India's National Policy on Biofuels, which of the following can be used as raw materials for the production of biofuels? 1. Cassava 2. Damaged wheat grains 3. Groundnut seeds 4. Horse grams 5. Rotten potatoes 6. Sugar beet. Select the correct answer using the code given below:

1. Cassava – Yes. The National Policy on Biofuels permits starch-based feedstocks for ethanol production; cassava is explicitly a starch-rich source. Verdict: Correct.

2. Damaged wheat grains – Yes. The policy allows damaged food grains unfit for human consumption for ethanol production. Verdict: Correct.

3. Groundnut seeds – No. The policy does not specifically list edible oilseed crops like groundnut seeds as approved raw material in this context; biodiesel feedstock is mainly non-edible oilseeds, used cooking oil, animal tallow, etc. Verdict: Incorrect.

4. Horse grams – No. Horse gram/pulses are not listed feedstocks under the policy for biofuel production. My earlier inclusion was an error. Verdict: Incorrect.

5. Rotten potatoes – Yes. The policy allows rotten/surplus agricultural produce such as rotten potatoes for ethanol production. Verdict: Correct.

6. Sugar beet – Yes. The policy includes sugar-containing feedstocks like sugar beet for ethanol production. Verdict: Correct.

Thus, the correct set is 1, 2, 5 and 6 only → (a).