This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Pathology
Which of these statements is FALSE about infective endocarditis in I.V. drug abusers- 
Select and explain. 
A. Candida is a common cause., B. Pulmonary valve is commonly involved, C. Staphylococcus aureus is commonest organism, D. Tricuspid valve is most commonly involved
B: Pulmonary valve is commonly involved
Answer: B: Pulmonary valve is commonly involved 
Explanation: Infective endocarditis in I.V. drug abusers usually involves the right side of the heart.
The tricuspid valve is most commonly involved.
The pulmonary valve is involved in fewer cases only.
The most common organism causing endocarditis in I.V. drug abusers is =>staphylococcus aureus.
Other common organisms are :
Candida
Enterococcus fetalis
Pseudomonas
Serratia marcescens