Confirming a specific biological cause of general paresis was greatly aided by eventually discovering that
a. all such patients had a history of syphilis.
b. most such patients developed syphilis later in life.
c. very few such patients had ever been treated with penicillin.
d. most such patients had lied about their sexual history.
Question 2
The correct biological explanation for general paresis
a. was discovered very quickly.
b. is still a mystery to scientists.
c. will never be discovered.
d. was only discovered after more than 100 years of study.