Available options:
(1). heterotrophs.
(2). by indirect light.
(3). critical organs.
(4). Deoxyribonucleicacid.
(5). Abnormal cell growth.
(6). Pulmonologists.
(7). electron microscope.
(8). one celled organisms.

Fact 1: Amold spore has a negative impact on the respiratory system. Fact 2: Pulmonologists treat lungs and respiratory systems. Given the two facts above, problems caused by mold spore in the body are treated by what kind of doctor?
Answer:
(6).