Misc: in which opera does the toreadors song feature?

Questions

Comfrey (herb) baths were popular before the wedding night to attempt to repair the hymen and thereby apparently restore _______?

The thyroid cartilage is more commonly known as the _____?

Stroking the sole of the foot is used by doctor's to produce _______?

Insulin is produced in the _________?

Acute hasopharyngitis is more commonly known as a ______?