This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Medicine
Monoprotic acid are 
Select and explain. 
A. Formic acid, B. Acetic acid, C. Nitric acid, D. All
D: All
Answer: D: All 
Explanation: A, B, C i.e. Formic acid, Acetic acid, Nitric acid Monoprotic acids (donating 1 proton) are hydrochloric acid (HC1), nitric acid (HNO3), formic acid (HCOOH), acetic acid (CH3COOH) and benzoic acidQ. Biprotic acids are sulfuric acid (H2SO4) and carbonic acid (H2CO3)Q arid triprotic acids are phosphoric acid (H3PO4) and citric acidQ