Which biological factor has been found to predict coronary heart disease?

Michael speaks perfectly fine while at home, but his teacher complains that he does not speak while at school. This is an example of:

a. Social anxiety disorder b. Generalized anxiety disorder c. Selective mutism d. Anxiety sensitivity

According to Herman von Helmholtz, creative dreaming results from

a. completely distracting yourself from the topic. b. saturating yourself in a problem or issue that interests you. c. utilizing various chemical substances. d. discussing your topic with other experts. e. listening to soothing music.