Normally, taken alone, neither substance would cause serious harm, but if taken together, the combination could cause coma or death. This is an example of:

Errors of ________ occur when the eyeball is either too long or too short, the lens loses its elasticity, or the lens or cornea has an irregular curvature.

A. retraction B. refraction C. renunciation D. retrusion

The question "Are you sure about that? It doesn't make sense to me." represents which method of collecting patient data?

A. Probing B. Challenging the patient C. Focusing on the patient D. Encouraging the patient to evaluate his situation E. Asking closed-ended questions