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What is Injection of Glucagon is effective for management of persistent hypoglycemia in all EXCEPT – and explain in detail?
Hypoglycemia in hyperinsulinmic state require IM glucagon as treatment.
Glucagon increases glucose level in blood by Glycogenolysis and Gluconeogenesis.
But in galactosemia - Liver is the first organ to be affected, so glucagon will unable to increase glucose as glycogenolysis and gluconeogensis can not occur ion already damaged liver.

Nesidioblastosis :

It is persistent hyperinsulinemic hypoglycemia occurs due to 0 - cell hypertrophy in infant of diabetic mother due to continuous maternal hyperglycemia.
Glucagon is effective in controlling such a hypoglycemic condition.