If a number p is prime, and 2p+1 = q, where q is also prime, then the decimal expansion of 1/q will produce a decimal with q-1 digits. If this method produces a decimal with 166 digits, what is the units digit of the product of p and q  Choose the correct answer:
A) 1
B) 3
C) 5
D) 7
E) 9
3/7 = 0.428571... (a repeating pattern one digit long)   3
<result>B</result>
If a number p is prime, and 2p+1 = q, where q is also prime, then the decimal expansion of 1/q will produce a decimal with q-1 digits. If this method produces a decimal with 166 digits, what is the units digit of the product of p and q