Identify the local molecular geometry and hybridization at atoms a and b in Ritalin, shown below, which is a drug used to treat attention deficit hyperactivity disorder. In the line drawing, the hydrogen atoms bonded to carbon are not shown explicitly. 
Definitions:
Oxygen
A chemical element with symbol O and atomic number 8, essential for respiration in many living organisms and for combustion.
Fermentation
A metabolic process that converts sugar to acids, gases, or alcohol in the absence of oxygen.
Alcohol
An organic compound characterized by one or more hydroxyl (-OH) groups attached to a carbon atom, commonly used in beverages, medicine, and as a solvent.
Lactic Acid
A compound produced in the muscles during strenuous exercise, responsible for the feeling of muscle fatigue.
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