Definition: You are given a question on nutrition. 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 does not occur with increasing age?

(A)A reduction in lean body mass (B)A reduction in bone density (C)An increased appetite (D)Impaired immune function

C