what the doctor ordered

Etymology
A reference to a doctor prescribing treatment to alleviate a patient’s illness, or a course of action (exercise, a healthy diet, relaxation, etc.) that will be beneficial to the patient’s health.

Noun

 * 1)  Exactly what is necessary or useful in a given situation; something very beneficial or desirable.

Translations

 * Catalan: anar com l'anell al dit
 * Finnish: juuri sitä, mitä lääkäri määrää
 * Russian:
 * Spanish: venir de perlas, venir que ni pintado,
 * Ukrainian: те, що лі́кар прописа́в