MRCOG II Past question

You wish to investigate the time it takes to perform a caesarean section on women with and without pre-eclampsia. At the end of the study you have two groups of women with the duration of caesarean sections recorded for each. It cannot be assumed that these are normally distributed. Which non-parametric statistic test would you use? 

A) Chi-squared test 

B) Linear regression analysis 

C) Mann-Whitney U test 

D) Students t-test 

E) Pearsons R test