Howard, a Middle-Aged Man, Is Suffering from Erectile Problems

Multiple Choice

Howard, a middle-aged man, is suffering from erectile problems. He consults his doctor to know about the likely causes for his condition. He tells his doctor that he has been suffering from diabetes and low blood pressure. He also tells his doctor that he is a weight lifter and hence spends 2 hours every day at the gym. He also tells his doctor that his recent blood test shows a lower level of natural killer (NK) cells. In this scenario, which of the following would the doctor mention as the most likely cause for Howard's condition?

A) diabetes
B) low blood pressure
C) low level of NK cells
D) excessive weight lifting