Which of the following statements are INCORRECT?
i. Glomerular capillaries are extremely thin walled.
ii. Diameter of afferent arteriole is greater than that of efferent arteriole.
iii. Glomerular filtrate is deproteinised plasma and is acidic in nature.
iv. PCT cells reabsorb low threshold substances like sulphates, nitrates actively against concentration gradient.
Select the correct option from given.

Apply the relevant identity from the chapter and substitute the values established in the previous step, keeping the original constraint in view.

Use the simplified expression to isolate the unknown, then plug the result back into the question setup to confirm the working is internally consistent.

Cross-check against a boundary or limiting case. Both the dimensional balance and the qualitative behaviour at the extreme should agree with the candidate answer.

Combine the steps above to identify the correct option. The remaining choices each fail at least one of the consistency, dimensional, or boundary checks.