8th February 2024

A 31-year-old female presents with severe abdominal pain and coffee-ground vomiting.

A 31-year-old female presents with severe abdominal pain and coffee-ground vomiting. She reports a 1.5-year history of dyspepsia refractory to the maximum doses of ranitidine and omeprazole treatment. She also reports concurrent watery diarrhoea that has been intermittent over this period. Upper GI endoscopy reveals multiple severe ulcerations affecting the stomach and duodenum. 

Which of the following hormones is most likely implicated with this condition?