Ablow to the head may cause diabetes insipidus by

a. triggering the hypersecretion of hypothalamic-inhibiting hormones
b. triggering the hyposecretion of hypothalamic-inhibiting hormones
c. interfering with the normal transmission of adh to the posterior
d. pituitary via the axons of hypothalamic neurons causing hypersecretion of adh

C. interfering with the normal transmission of ADH to the posterior pituitary via the axons of hypothalamic neurons

Explanation:

nephrogenic diabetes insipidus results from failure of the kidneys to respond to ADH,

Central diabetes insipidus head injury or blow that cause damage to the hypothalamus or pituitary gland

Answers are C and D.

Explanation:

Diabetes insipidus is a disease that affect or hinder the secretion of or response to the vasopressin, a pituitary hormone is impaired.

It is caused by damage to the pituitary gland or hypothalamus which may result through head injury, tumor, etc.