 From the passage, what is said to be the most common complaint of man?
"Doctor," Mitchell said, "what would you say the most common complaint of man is?" "I would have said the common cold," Macklin replied, "but I suppose from what you have said you mean headaches." "There are a number of different causes for headaches—nervous strain, fatigue, physical diseases from kidney complaints to tumors, over-indulgence—but there is one effect of all of this, the one real cause of headaches," Mitchell announced. "That is, the constriction of blood vessels in the telencephalon section of the frontal lobes. "On rats, on chimps...." Conscientious objectors from the Army."
 headaches
 sinus infections  headaches  The common cold  lack of sleep