Based on the information present in the given passage, you need to write a correct answer to the given question. A correct answer is one that correctly and completely answers the question. Do not write answers that address the question partially or incorrectly. The correct answer must be contained in the given paragraph.

Example Input: Paragraph- Sent 1: Dr. Benjamin Stone is a hotshot young surgeon who longs to leave the drudgery of a Washington , D.C. emergency room and finally leaps at his chance at more money and less death as a plastic surgeon in Beverly Hills .
Sent 2: On his last day , Ben's relationship with his co-workers is presumed to be anything but a warm one .
Sent 3: None of his colleagues will join him for a drink and a cake in his honor has an iced portion of the phrase '' Good riddance , asshole '' sliced out .
Sent 4: Ben's cross-country drive in a 1956 Porsche 356 Speedster is interrupted when he crashes in the rural hamlet of Grady , South Carolina .
Sent 5: The crash damages the fence of local Judge Evans , who sentences him to community service at a nearby hospital .
Sent 6: Ben offers to pay for the fence , but the stern judge increases his community service each time he talks back .
Sent 7: Defeated , he reports to the hospital , where Nurse Packer humbles him by ordering him to clock in and out , as would a factory worker .
Sent 8: Though upset , Ben quickly makes friends with Mayor Nick Nicholson , the town cafe's proprietor/head waitress , and Melvin , the local mechanic tasked with repairing Ben's car .
Sent 9: Ben soon finds his clinic work to be much more laid-back than the emergency room .
Sent 10: He has simple cases such as spots before the eyes , fishing hook impalings , and even reading mail for a young illiterate couple , whose baby he later delivers .
Sent 11: The experience also humbles Ben when he mistreats a case of mitral valve regurgitation leading to late cyanosis in the child .
Question: Who has simple cases.
Example Output: Dr. Benjamin Stone.

Example Input: Paragraph- Sent 1: Oh no!
Sent 2: Your younger sister just mixed up all of your LEGO parts.
Sent 3: Now you have to put them all back into the original categories.
Sent 4: How will you do this?
Sent 5: You sort them by size and shape until they are each back into their specific place in the tray.
Sent 6: What do you think you could have called the mess your younger sister created?
Sent 7: Thats right, it is a mixture.
Sent 8: Fortunately, it was a physical change and she just made a simple mixture.
Sent 9: You are able to separate them back into order.
Sent 10: Its a good thing she did not toss them into the fireplace.
Sent 11: That would have caused a chemical change as they all melted together.
Sent 12: If your LEGOs were melted, you would be out of luck for building that next big project.
Question: Why do you have to sort your LEGOs and put them in the tray?.
Example Output: Your sister mixed them together.

Example Input: Paragraph- Sent 1: Einstein was displeased with quantum theory and mechanics (the very theory he helped create), despite its acceptance by other physicists, stating that God "is not playing at dice."Sent 2: Einstein continued to maintain his disbelief in the theory, and attempted unsuccessfully to disprove it until he died at the age of 76.
Sent 3: In 1917, at the height of his work on relativity, Einstein published an article in Physikalische Zeitschrift that proposed the possibility of stimulated emission, the physical process that makes possible the maser and the laser.
Sent 4: This article showed that the statistics of absorption and emission of light would only be consistent with Planck's distribution law if the emission of light into a mode with n photons would be enhanced statistically compared to the emission of light into an empty mode.
Sent 5: This paper was enormously influential in the later development of quantum mechanics, because it was the first paper to show that the statistics of atomic transitions had simple laws.
Sent 6: Einstein discovered Louis de Broglie's work, and supported his ideas, which were received skeptically at first.
Sent 7: In another major paper from this era, Einstein gave a wave equation for de Broglie waves, which Einstein suggested was the Hamilton-Jacobi equation of mechanics.
Sent 8: This paper would inspire Schrodinger's work of 1926.
Question: After discovering Louis de Broglie's work, what did Einstein give for de Broglie waves?.
Example Output:
A wave equation.