Which of the following statements is true regarding the measurement of patients' pain?
Group of answer choices:
a) Research has shown that physicians often underestimate their patients' pain intensity.
b) Continuous measures of pain intensity can ensure that assessments of patient pain are free of cultural bias.
c) The visual analog scale is a pictorial measure of pain intensity.
d) Physicians are likely to overestimate pain in African American patients compared to all other ethnic groups.