question: What are the major organs of the immune system ?
answer: thymus and bone marrow , and chief lymphatic tissues such as spleen , tonsils , lymph vessels , lymph nodes , adenoids , and liver
turker_answer: The thymus and bone marrow , and chief lymphatic tissues such as spleen , tonsils , lymph vessels , lymph nodes , adenoids , and liver are the major organs of the immune system .
rule-based: The major organs of the immune system are thymus and bone marrow , and chief lymphatic tissues such as spleen , tonsils , lymph vessels , lymph nodes , adenoids , and liver .