The incomplete combustion of firewood in homes produce a poisonous gas 'X'. When inhaled gas 'X' combines with substance 'Y' present in blood and reduces the capacity of blood to carry gas 'Z' causing respiratory problems. Identify 'X', 'Y' and 'Z':

• A. X-Carbon-mono-oxide, Y-Oxygen, Z-Carbon-di-oxide
• B. X-Carbon-di-oxide, Y-Water, Z-Carbonic Acid
• C. X-Carbon-mono-oxide, Y-Hemoglobin, Z-Oxygen
• D. X-Carbon-di-oxide, Y-Blood platelets, Z-Oxygen