In this task, you are given two facts, and a multiple-choice question. Based on the given facts, answer the question with index of the correct option (e.g, "A").
Q: Fact1: Some arthropods have special excretory structures., Fact2: Arthropods contain jointed appendages., Question: Some animals with jointed what have special excretory structures (A) skin (B) appendages (C) they bend (D) eyes (E) muscles (F) sensory neurons (G) organ (H) insects
A:
B