Definition: You are given a question on high school chemistry. You are also given 4 answer options (associated with "A", "B", "C", "D"), out of which only one is correct. You need to answer the question by selecting the correct option. You should only answer with the choice letter, not the whole answer.
Input: Which of the following is incorrectly named?
(A)CaCl2   calcium chloride (B)Fe(NO3)3   iron(III) nitrate (C)AlBr3   aluminum tribromide (D)K2Cr2O7   potassium dichromate

C