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: What is an alpha particle?
(A)Another name for an electron (B)Another name for a helium nucleus (C)Another name for a positron (D)Another name for a cosmic ray

B