This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Pathology
[{'content': 'A 40 year old female patient presents with excessive bleeding. Patient gives a history of road traffic accident 5 hours ago and had a lacerated wound on lower back region. Blood grouping test reveals presence of Anti A antibody, Anti B antibody, Anti H antibody and Anti Rh D antibody in the serum. The blood group of this patient is? \nSelect and explain. \nA. O positive, B. O negative, C. AB positive, D. Bombay blood group', 'role': 'user'}, {'content': 'Answer: D \nExplanation: → Apart from A< B and O RBC of type O contains large amount of another antigen called H substance.\n→ H substance is genetically different from ABO but is a precursor of A and B antigens.\n→ An O group individual who inherits A or B genes but fails to inherit H gene from either parent is called Oh phenotype or Bombay blood group.', 'role': 'assistant'}]