This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: General Epidemiology, Subject name: Social & Preventive Medicine
Which of the following is not an example of Direct transmission in communicable disease? 
Select and explain. 
A. Transplacental, B. Soil contact, C. Droplet nuclei, D. Skin contact
C: Droplet nuclei
Answer: C: Droplet nuclei 
Explanation: Direct transmission includes the following modes of transmission: 1. Direct Contact 2. Droplet infection 3. Contact with soil 4. Inoculation into skin/mucosa 5. Trans-placental (veical) Indirect transmission: 1. Vehicle-borne 2. Vector-borne Mechanical Biological 3. Air-borne Droplet nuclei Dust 4. Fomite-borne 5. Unclean hands and fingers