Read the following statements and choose the correct option.

Assertion (A) : Biomass and Fossil Fuels are the two main conventional sources of energy.

Reason (R) : Conventional sources are those which are renewable in nature.

The correct option is (A) is true, but (R) is false.

Analysis of Assertion (A):
Conventional sources of energy are those that have been in use for a long time and traditional practices surround their application. Biomass (such as firewood and cow dung) and fossil fuels (coal, petroleum, and natural gas) are major conventional energy sources historically used by humans. Therefore, Assertion (A) is true.

Analysis of Reason (R):
Conventional energy sources, particularly fossil fuels, are generally non-renewable as they take millions of years to form and get depleted quickly with continuous usage. Non-conventional sources of energy (like solar, wind, and tidal energy) are renewable in nature. Therefore, stating that conventional sources are renewable is incorrect. Reason (R) is false.

Conclusion:
Assertion (A) is correct, but Reason (R) is incorrect.