Giant Gastric ulcer

Q) Which of the following is true about giant gastric ulcer?

a) 70-80% of these ulcers  are malignant
b) By definition giant gastric ulcer is more than 1.5 cm in size
c) Medical therapy can heal 80% of  such ulcers
d) They are more common on the greater curvature and invade surrounding organs like spleen, liver etc

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