The Central Government, or as the case may be, the State Government, shall be liable for a claim by any person entitled under this Act, except in the case of war, flood, drought, fire, cyclone or earthquake affecting the regular supply of foodgrains or meals to such person under this Act:

   Provided that the Central Government may, in consultation with the Planning Commission, declare whether or not any such situation affecting the regular supply of foodgrains or meals to such person has arisen or exists.