During a PLAB 2 history station, a 55-year-old man presents with a change in bowel habit. Which features would prompt an urgent 2-week wait cancer referral?
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A
Occasional constipation relieved by dietary changes
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B
Unexplained change in bowel habit lasting >4 weeks in a patient over 40, especially with rectal bleeding, weight loss, or iron deficiency anaemia
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C
Loose stools for 2 days after a curry
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D
Alternating constipation and diarrhoea for 10 years with normal investigations