Definition: You are given a question on astronomy. Astronomy is a natural science that studies celestial objects and phenomena. 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: The Large Magellanic Cloud is ...
(A)a dwarf galaxy orbiting the Milky Way. (B)the closest planetary nebula to the Earth. (C)a bright star cluster discovered by Magellan. (D)the outer arm of the Milky Way named after Magellan.

A