Name The Year: First Income Tax imposed.?

Questions

An average, in America, three sex change operations are performed _______?

In 1977, Napoleon's _____ was sold in Paris for about US $3 800 to an American urologist?

The most sensitive cluster of nerves is at the base of the ____?

In 1855, dentist Robert Arthur was the first to use ____ to fill cavities?

The fleshy muscular organ joined to the hyoid bone is the ____?