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: Physiology
[{'content': 'Secretors are those who? \nSelect and explain. \nA. Secrete enzymes in blood, B. Secrete immunoglobulin in intestine, C. Secrete blood group antigen in sweat/saliva, D. Secrete hormones in response to stress', 'role': 'user'}, {'content': "Answer: C \nExplanation: Ans. is'c'i.e., Secrete blood group antigen in sweat/saliva", 'role': 'assistant'}]