This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: All India exam, Subject name: Pathology
Carbonic anhydrase is an enzyme that occurs in plants, bacteria, and animals and is involved in the formation of which chemical? 
Select and explain. 
A. Carbon dioxide from carbon and oxygen, B. Carbonic acid from carbon dioxide and water, C. Bicarbonate ion from carbonic acid, D. Hydrochloric acid
B: Carbonic acid from carbon dioxide and water
Answer: B: Carbonic acid from carbon dioxide and water 
Explanation: Carbonic anhydrase catalyzes the formation of carbonic acid from carbon dioxide and water. It is not involved in the formation of carbon dioxide from carbon and oxygen, bicarbonate ion from carbonic acid, hydrochloric acid, or hypochlorous acid.