This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Dental
An investigator wants to study the association between maternal intake of iron supplements (Yes or No) and birth weights (in gm) of new born babies. He collects relevant data from 100 pregnant women and their newborns. What statistical test of hypothesis would you advise for the investigator in this situation? 
Select and explain. 
A. Chi-square test, B. Unpaired or independent t - test, C. Analysis of variance, D. Student t — test
B: Unpaired or independent t - test
Answer: B: Unpaired or independent t - test 
Explanation: None