Definition: You are given a question on clinical knowledge. 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 would not be done before catheterizing?
(A)Gain patient consent. (B)Patient to be washed. (C)Expiry dates to be checked. (D)Ring patient's next of kin.

D